Sales & Revenue Operations
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Infrastructure That Fits Your Stack — Without BecomingYour Problem
You’ve built the systems. You manage the tools. You’re the one who has to make sure everything integrates, stays healthy, and scales without creating operational debt.
The sending layer is often the part that doesn’t fit cleanly. It sits between your CRM, your sequencing tools, your data pipelines, and your team’s workflows — and it’s fragile. Domains warm up slowly. IPs accumulate risk signals nobody monitors. DNS configurations drift over time. When deliverability breaks, you’re the one investigating bounce codes and updating SPF records instead of running operations.
Production-grade email infrastructure removes that burden. It gives you a managed sending layer that integrates cleanly with your existing stack, scales predictably, and stays healthy without requiring you to operate it day-to-day.
Senders offers three services that work independently or together. Here’s how each fits into what you manage.
Managed Email Infrastructure
You want the sending layer managed without rearchitecting your entire stack.
Managed Email Infrastructure is the foundation. We operate the domains, subdomains, IPs, DNS, authentication, warming, monitoring, and reputation management — the entire sending layer underneath your campaigns.
The separation is clean. Your team keeps using whatever tools and workflows you already run — Apollo, Outreach, Salesloft, HubSpot, custom systems. We manage the infrastructure underneath. Nothing changes in how your team operates day-to-day. What changes is that the sending layer is professionally managed instead of cobbled together.
What that means in practice: DNS configurations reviewed line by line and kept current. Pre-warmed IPs with established behavioral profiles, not cold infrastructure you have to nurse through a warm-up cycle. Aged domains deployed through controlled subdomain architecture. Continuous monitoring of bounce patterns, rejection signals, inbox placement trends, and gateway behavior — with active intervention when something shifts, usually before you’d notice.
There’s no lock-in on the campaign side. Your domains are yours. Your tools are yours. Your data is yours. If you decide to move infrastructure in-house, you take everything with you. The most common transition is teams bringing campaign execution in-house while keeping the managed infrastructure underneath.
For operations teams, the key value is predictability. Volume scaling follows a controlled framework — each new domain or sender goes through the same warmup and ramp-up process. There’s no ad hoc infrastructure management, no debugging DNS at 9 PM, no wondering why Gmail suddenly throttled your sends.
Outbound Operations
You need outbound execution that plugs into your existing tools and processes cleanly.
If you need to stand up outbound quickly — or hand off execution so your team can focus on systems rather than campaigns — Outbound Operations provides full-service execution on top of the managed infrastructure.
All outbound lives in Apollo. Your team has full access to audiences, campaigns, copy, and performance data. There are no proprietary dashboards or black boxes. The system is designed to be transparent and portable from day one — if your team eventually takes over execution, the transition is clean because everything was built in tools you already have access to.
From an operations perspective, Outbound Operations reduces the coordination burden. Instead of managing campaign execution alongside infrastructure health alongside tool configuration, your team sets direction and our team handles the implementation. The weekly time commitment is under one hour.
This is often used as a bridge: teams start with full Outbound Operations, then transition campaign execution in-house once they have internal capacity, while continuing to use Managed Email Infrastructure for the sending layer.
Deliverability Consulting
You suspect your systems are interacting in ways that hurt deliverability, and you need someone who can see the full picture.
Complex stacks create complex deliverability problems. Multiple sending tools, multiple domains, multiple teams sending from overlapping infrastructure — when something degrades, the cause often spans systems. The CRM is misconfigured. A third-party integration quietly changed authentication. An old subdomain no one uses anymore is dragging down domain reputation.
Deliverability Consulting is scoped advisory work. We review the full picture — authentication across all sending surfaces, domain and IP health, tooling interactions, and sending behavior patterns — and give you a clear diagnosis with prioritized remediation.
This is useful when your existing setup is underperforming but you’re not ready to move to managed infrastructure. It’s also useful as a pre-migration audit: understanding exactly what you have, what’s broken, and what needs to change before you make a bigger commitment.
This Is For You If…
- You need the sending layer to work reliably without becoming another system you manage
- You want infrastructure that integrates with your existing stack — not a replacement for it
- You’re scaling volume and need predictable throughput, not ad hoc infrastructure management
- You want full visibility into what’s running underneath without the operational burden of running it
- Vendor lock-in is a real concern and you need a clean exit path at any point
- You need someone who can diagnose cross-system deliverability issues that span your full stack
Where to Start
Talk to our team. We’ll review what you’re running, how the infrastructure isset up, and where the gaps are — so you can make an informed decision aboutmanaged infrastructure, operational support, or a scoped diagnostic. No blackbox sales process. Just a technical conversation with people who understandthe stack.
Our Experience
We work with companies from a wide variety of industries, predominantly in the B2B sphere, but we don't play favorites.
SMB SaaS
You want to move upmarket, but enterprise inboxes don’t trust new senders. We help you build the reputation that opens doors beyond SMB.
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Health and Medical
Heightened security around patient data means aggressive filtering—even for legitimate outreach. We help you land in inboxes that are designed to keep strangers out.
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HR (Human Resources)
HR buyers sit inside large organizations with enterprise-grade filtering. Reaching them requires infrastructure that can survive that level of scrutiny.
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Agencies
Your best prospects have the tightest defenses. Without production-grade infrastructure, you end up fishing where the filters are weakest—not where the clients are best.
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Cyber Security
You’re selling protection, but your emails look like the threat. We build infrastructure that signals credibility to the systems you’re trying to get past.
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FinTech
Trust is the product. Disposable domains and inbox sprawl undermine that from the first touch. We help you show up like the serious partner you are.
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Testimonials
"Beyond deliverability expertise, we wanted an outreach partner with a strong understanding of the VC/startup...'' Read full case study
Arc
"There are so many moving parts of our business – why should we deal with as many moving parts needed for email...'' Read full case study
Stephanie Corder
"Getting things done more efficiently is a big part of what 8base is about. We understand the importance of fostering...'' Read full case study
8base
"Our experience with Senders has been great over the years. Lead Strategist (Velimir) and the team are able to adapt...'' Read full case study
Growrk
"We wanted an efficient, scalable way to reach more people who could benefit from our platform. Email outbound...'' Read full case study
SuccessionHR
"We wanted to add more volume to our campaigns without worrying about the backend – email warming...'' Read full case study
Pangea
"Compliance is at the core of our business, and deciding to reach out to prospects meant we wanted to make sure...'' Read full case study
Dataships
"Senders provides strategists who communicate effectively and execute the strategies that their team formulated for us...'' Read full case study
SUSO Digital
Senders Case Studies
SUSO Digital
- Industry - Marketing & SEO
- Project length - 2 years
- Key result - Market growth, funnel saturation
Growrk
- Industry - Information Technology & Services
- Project length - Ongoing
- Key result - New market penetration
Pangea.io
- Industry - Fintech
- Project length - Ongoing
- Key result - Safely scaled email outbound, moved off of Google, improved processes
Momofuku
Founded by chef David Chang, Momofuku is a renowned culinary brand with a nation-wide presence, including restaurants and an online store with delicious goods. They ran into an issue with their email sending – high bounce rates and blocked sending. With hundreds of thousands of people on their email lists eager to stay informed, and an impeccable reputation to uphold, Momofuku wanted to nip this problem in the bud quickly.
- Momofuku reached out to Senders to run a diagnostic test on their sending infrastructure and find the root cause
- Senders deliverability experts discovered an issue with their DMARC, which was preventing emails from being sent, as their WordPress wasn't aligned with their SPF
- Senders provided the most effective solution helping Momofuku restore safe sending, and suggested next steps to ensure everything keeps running smoothly on their end
- The client reported that Senders helped identify the problem and got them back on track
Andrew Yeung
Where many others see a problem, Andrew sees an opportunity. His work may center around product leadership at Google (and previously Meta), but his true calling is all about bringing brilliant change-makers together.
How it started: Andrew hosted small-scale dinners for a handful of people at the peak of the pandemic in NYC, to enable safe connections during the most isolating times. How it’s going: His events now count as many as 2,000 tech leaders each, and he has set up 100+ such parties for more than 15,000 people in the past couple of years. Andrew understands that if two minds are better than one, putting two thousand together, preferably in the same room, can make a profound difference.
Given the impact of his community-building efforts, people want him to be able to reach out – and email is often the best way to do so. So, we helped out a bit.
- Andrew came across deliverability issues that prompted him to get in touch with Senders and look into the best possible solutions
- The Senders team made the necessary domain configuration adjustments, with a focus on the domain’s email authentication settings to enhance security and deliverability
- The SPF record was updated to include “Brevo” (Sendinblue) to strengthen authentication and reduce the chance of landing emails into spam
- The DMARC policy update enabled better readability of DMARC reports for human analysts, which is essential for preventing email spoofing and phishing
- Senders fixed the missing DKIM setup with Google, so that it now shows the email hasn’t been tampered with in transit
- As a result, the client now has better, more stable email deliverability and security
Myrina.ai
Stands out as a trailblazer in empowering women entrepreneurs through technology and a supportive community.
Myrina.ai offers a cutting-edge range of AI-powered SaaS marketing and sales tools that cater specifically to female entrepreneurs and women-led businesses. Myrina.ai enables users to automate marketing and sales, while helping them scale their authentic selves while saving time and boosting conversions. Their Myrina’s Army community fosters a supportive platform that champions female entrepreneurs and their values, empowering them to conquer barriers and achieve their business goals. The company's dedication to providing not only top-notch technological solutions but also a platform for networking and mentorship underscores their commitment to fostering success among women in the entrepreneurial space.
Naturally, they wanted to make sure their email sending infrastructure was set up correctly to protect their reputation and successfully reach their recipients. Our deliverability team worked with the client’s team on:
- Aligning the client’s three domains with Amazon to make sure they are compatible and optimized in order to integrate with Amazon’s system
- Setting up a proper DMARC policy to protect their domains against unauthorized use and phishing scams
- Enhancing email deliverability as well as security, so that each email sent from these domains can be properly authenticated and more likely to land in the right inbox
- As a result, the client can protect the reputation of their business and domains, while safely sending out their email campaigns
Physician’s Choice
Sometimes the sheer number of options of any product can be daunting – how on earth do you pick the right one? This is especially true with supplements, as we can find them just about anywhere, but we can rarely understand a third of the ingredients listed. Unlike most, Physician’s Choice provides supplements with pure, potent ingredients that work. No fillers or “proprietary” blends with unidentified ingredients. They do the research, so you don’t have to.
- The client’s team spotted issues with DMARC failures in Google Postmaster
- The Senders deliverability team worked with the client to update the DMARC configuration to enable report collection
- The client is now able to obtain detailed reports to diagnose the exact causes of the failures and prevent them in the future with proper DMARC setup
Schedule a meeting
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Email Spam Test Tools
To deep-dive into your deliverability challenges, prevent future issues, and improve inbox placement, try our complimentary Email Spam Test Tool.
Use Cases
It’s more than just keeping your emails out of spam – our approach protects your domain reputation, while helping you grow your sales pipeline with valuable, relevant prospects. Our infrastructure + methodology enable you to scale your cold campaigns safely and focus on engagement and closing deals.
Senders Protocol works for every kind of email, including your newsletter and opt-in marketing campaigns. Setting up and keeping your sending systems in good shape will boost your inbox placement, and free up your time to focus on strategy and creative – although we can help with those, too.
If you’re using email as one of your main internal communication channels – sending out employee newsletters, company announcements, invites, etc – deliverability matters here, too. Our methodology focuses on safety across the board, so your internal emails can grow on pace with your team, and always land where they need to.
Time-sensitive, system-triggered emails are a crucial part of your customer experience, as well as your overall reputation. To make sure they arrive on time (every time) and land in the inbox, Senders optimizes your infrastructure and separates transactional from marketing or cold emails (using subdomains/IPs), preventing one from harming the other’s performance.
Book a Free Troubleshooting Session
Our Deliverability expert will put your sending problems in perspective, determine the root cause, and suggest the best solutions to implement.
FAQ
How does Managed Email Infrastructure fit into our existing tech stack without requiring a rearchitecture?
The separation is clean by design. Managed Email Infrastructure operates the sending layer — domains, subdomains, IPs, DNS, authentication, warming, monitoring — and nothing else. Your tools, workflows, CRM, sequencing platform, data pipelines, and reporting stay exactly as they are.
Your team continues using whatever campaign tools you already run — Apollo, Outreach, Salesloft, HubSpot, custom systems. Campaigns go through the same interfaces. The only thing that changes is what's underneath: the infrastructure those campaigns send through becomes professionally managed rather than self-managed or default.
The integration is at the infrastructure level, not the application level. We're not inserting middleware into your stack or requiring API integrations. We're operating the DNS, domains, and IPs that your sending tools point at. That means there's no rearchitecture, no workflow disruption, and no new tools for your team to learn.
From an operations perspective, this removes the infrastructure layer from your operational burden without affecting the layers above it. You keep your tooling, your processes, and your data flows. We handle the part that requires specialized knowledge to maintain over time.
What happens to our domains, DNS, and authentication? Who controls what?
Your domains remain your assets. Ownership doesn't change.
What we manage is the operational configuration: subdomain architecture, DNS records (SPF, DKIM, DMARC, MX alignment), IP assignment, warming protocols, and ongoing maintenance. We review DNS configurations line by line for every active domain — not just to pass basic diagnostic checks, but to ensure alignment with what security-conscious inboxes expect from legitimate, established senders.
The control model is straightforward. We make configuration changes to the sending infrastructure based on defined protocols and best practices. All changes are documented and communicated. You have full visibility into what's configured and why. If you need to make changes on your side — adding a new tool, modifying a sending stream, changing DNS for other purposes — we coordinate to ensure alignment.
We also perform periodic DNS audits even when no changes are reported on your end. Infrastructure updates, internal system changes, or third-party tools can quietly introduce issues that affect deliverability over time. These audits catch creeping problems before they compound.
If you leave the engagement, your domains go with you. The DNS configurations we've implemented remain in place until you change them. What you lose access to is the managed IP layer and ongoing monitoring — the operational service, not the assets.
Can we use our own sending tools (Apollo, Outreach, Salesloft) on top of Senders infrastructure?
Yes. That's the intended use case for Managed Email Infrastructure when it's operating independently of Outbound Operations.
Your team keeps using whatever tools they already have. Apollo, Outreach, Salesloft, HubSpot, custom SMTP configurations — whatever sends the email. We manage what's underneath: the domains, IPs, DNS, authentication, and reputation that those tools send through.
The campaign tool handles what to send, when, and to whom. Our infrastructure handles whether it actually reaches the inbox. The two layers are independent. Changing your campaign tool doesn't require changes to the infrastructure. Upgrading your infrastructure doesn't require changes to your campaigns.
From an operations perspective, this means you're not locked into any particular front-end tooling because of your infrastructure choice. If you switch from Outreach to Apollo, or add Salesloft alongside what you're already using, the infrastructure layer doesn't care. It works underneath all of them.
What does the monitoring and reporting layer look like? What visibility do we get?
Monitoring is continuous and multi-layered. We track bounce classifications and rejection patterns (not just hard vs. soft bounces, but specific rejection codes and what they indicate), inbox placement trends by target environment where trackable, signals from enterprise gateways and policy-driven controls, IP and domain reputation indicators, and behavioral patterns that might signal emerging issues before they become visible in aggregate metrics.
When something shifts, we intervene. That might mean adjusting volume, rotating an underperforming IP, modifying a DNS configuration, or escalating a finding that requires a change in sending behavior. The response depends on the signal, but the key is that we're watching and acting, not waiting for things to break.
We also take anecdotal signals seriously. If someone on your team hears from a prospect that a message landed in spam, or notices something off, we investigate it. Real-world signals often surface issues that automated monitoring alone wouldn't catch.
Is there vendor lock-in? What's the exit path if we bring infrastructure in-house?
No lock-in on the campaign side. Your domains are yours. Your campaign data, audiences, copy, and workflows are yours. Your tools are yours. If you leave, all of that stays with you.
What isn't portable is the managed infrastructure service itself — the pre-warmed IPs, the IP reputation we've built, the backend sending layer, and the ongoing monitoring and intervention. That's the service you're renting access to. It stays with us when the engagement ends.
The most common transition we see isn't teams leaving entirely — it's teams who started with full Outbound Operations bringing campaign execution in-house while keeping the managed infrastructure running underneath. That's a clean handoff because the system is designed to support that separation.
If you do want to bring the infrastructure fully in-house, we provide a documented transition. The DNS configurations we've implemented remain in place on your domains. You'd need to source and manage your own IPs, monitoring, and ongoing maintenance — but you're not starting from zero. The domain reputation and authentication posture we've built transfer with the domains.
The design philosophy is that you should stay with us because the service is valuable, not because leaving would break your operations.
How do you handle IP or domain underperformance? What's the intervention protocol?
We catch it and act on it — usually before you notice.
When an IP starts underperforming, it gets removed and replaced immediately. We operate clusters of pre-warmed IPs with established track records, so we can rotate in a proven replacement without pausing your sending or forcing a rewarming event. Continuity is maintained while the root cause is investigated.
Domain-level issues are handled differently depending on the cause. If a domain's reputation shows signs of degradation, we diagnose the source — whether it's a volume issue, a content pattern, a target audience response, or something external. The subdomain architecture gives us the ability to shift volume and isolate problems without affecting the broader system.
The approach is proactive, not reactive. Defined thresholds trigger automated investigation and action. Escalation protocols are documented. When intervention happens, it's logged and communicated — what happened, why, what we did. Nothing happens in a black box.
This is a meaningful difference from self-managed setups, where a degraded IP often means weeks of rehabilitation or a forced restart. Because we maintain proven replacement capacity, problems get solved without operational disruption.
Can we start with Managed Infrastructure and add Outbound Operations later — or the reverse?
Yes, in both directions. The services are designed to be modular.
Starting with Managed Infrastructure and adding Outbound Operations later is common for teams that have internal campaign execution capacity today but anticipate needing to offload that as they scale, or teams that want to see how the infrastructure performs before committing to full execution support.
Starting with Outbound Operations (which includes Managed Infrastructure) and later transitioning campaign execution in-house while keeping the infrastructure is the most common transition path. This typically happens when a team builds internal capacity — hires SDRs, develops processes — and wants to run campaigns themselves while maintaining the production-grade sending layer.
The transitions are clean because the system is designed for it. When you move from Outbound Operations to Managed Infrastructure only, the Apollo account, all campaign data, audiences, and structure remain yours. The infrastructure layer continues without disruption. Your team just takes over the campaign execution side.
If you're the one making the business case for this decision, our CEOs & Founders page covers how to think about the investment and the progression.
How does Senders compare to self-managed SMTP (Mailgun, SendGrid) or rotation-based tools (Instantly, Smartlead)?
Self-managed SMTP services like Mailgun and SendGrid give you the ability to send email. What they don't give you is the ongoing infrastructure management that determines whether that email actually reaches the inbox over time.
The core issue with self-managed SMTP: building strong IP reputation using only cold outbound traffic is very difficult. Cold email alone doesn't generate the volume patterns and engagement signals that inbox providers use to establish trust. Your IPs stagnate or degrade, and recovery is slow and resource-intensive. Add the risk of shared IP pools — where your sending reputation is affected by neighbors you can't control — and the "cheap and easy" appeal starts to look very different.
Rotation-based tools like Instantly and Smartlead take a different approach: they distribute risk across many disposable domains and inboxes. The idea is that if any one gets flagged, the others keep running. The problem is that this model doesn't build credibility — it avoids scrutiny through fragmentation. And modern enterprise filtering systems are specifically designed to detect that pattern. Excessive domain rotation, short-lived senders, and unnatural sender graphs are signals, not solutions.
With Managed Email Infrastructure, you're sending on aged domains with real history, pre-warmed IPs with established behavioral profiles, and a continuously managed authentication posture. The infrastructure is built to sustain trust over time, not just move messages through a pipe or fragment across disposable identities.
What volume limits should we expect per domain and per sender? How does throughput scale?
As general guidelines: a single domain on our infrastructure supports up to roughly 4,000 emails per day, and a single sender typically operates at around 800 emails per day. Many of our clients operate well beyond those per-domain numbers by running multiple domains through the same managed framework.
These aren't hard ceilings — they're per-unit operating guidelines shaped by the specific sending environment: the age and history of the domains, the target audience's filtering posture, engagement patterns, and other signals. There are situations where we'd push beyond those numbers on a single domain, and situations where we'd deliberately stay below them. The goal is sustainable throughput, not maximum blast volume.
Volume scales through the same controlled process. Every new domain or sender goes through a warmup period to establish credibility, followed by a gradual ramp-up. Once the infrastructure reaches its operating run rate, throughput remains stable because the foundation has earned the trust to support it.
If your volume needs grow, we add capacity through the same framework — additional domains, additional senders, additional IP support — without changing the operating model or introducing fragility. From an operations perspective, scaling is predictable and repeatable, not ad hoc.
What if we only need a deliverability audit, not ongoing managed infrastructure?
That's what Deliverability Consulting is designed for. It's a scoped, advisory engagement — not an infrastructure takeover.
The Diagnostic & Quick-Fix session reviews your full sending environment: authentication across all sending surfaces, domain and IP health, tooling interactions, sending behavior patterns, and actual inbox placement signals. You get a clear diagnosis with prioritized remediation — what to fix, what to leave alone, and how to verify the fix worked.
Your team stays in full control. We diagnose and guide; you implement. Many issues can be resolved within the diagnostic itself. When they can't, the diagnostic establishes the scope for a targeted follow-on engagement.
This is useful when your existing setup is underperforming but you're not ready to move to managed infrastructure. It's also useful as a pre-migration audit — understanding exactly what you have and what needs to change before making a bigger commitment.
If the audit reveals that the problems are systemic — infrastructure-level issues that will keep recurring without a structural change — that's usually when the conversation about Managed Email Infrastructure becomes relevant. But the consulting engagement never assumes or requires that transition.
