Can You Help During an Active Deliverability Crisis?

February 12, 2026

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Yes. An active crisis is often how companies find us. Mail that was landing in the inbox consistently is now going to spam. Bounce rates spiked 10x. Complaints jumped from 0.2% to 2%. Engagement dropped sharply – open rates fell by 50% overnight. It happened suddenly, or at least it feels sudden, and you need to understand why it happened and how to fix it fast.

A crisis is actually one of the better times to get consulting because the problem is usually visible. You can see the damage in metrics. You just need to understand its cause so you can fix it.

Rapid Triage

When a deliverability crisis hits, your immediate need is triage: What broke, why did it break, and what’s the immediate fix? This determines whether you’re fixing something today or starting a recovery program.

Most crises fall into one of a few distinct categories:

Reputation damage: Your IP or domain reputation dropped suddenly, triggering filtering or delivery delays. This usually happens after a complaint spike or after suspicious sending activity. You’ll see mail that used to arrive in seconds now delayed by hours, or mail that used to hit the inbox now going to spam.

Configuration change: Something in your infrastructure or sending behavior recently changed, triggering filter response. Maybe you changed ESPs. Maybe you added a new sending IP. Maybe you changed your authentication setup. Maybe your DNS record got corrupted. The change happened, and suddenly everything broke.

Behavior spike: Your sending volume spiked (you ramped from 10k to 100k emails a day), or your complaint rate jumped (people are complaining at rates they weren’t before), or your engagement changed sharply (suddenly fewer people are opening). These behavior changes trigger mailbox provider filters.

List or content issue: You changed your sending list (you switched to a purchased list, or you mailed an old dormant list), or you changed your copy pattern (you started testing new subject lines that trigger spam filters). The change happened, and suddenly filtering increased.

Authentication or infrastructure problem: Something in your technical setup broke. SPF record is broken. DKIM signing stopped working. Your reverse DNS got deleted. An authentication issue that was lurking suddenly became critical.

We can often identify which category you’re in within the first 15-20 minutes. We pull your reputation data from multiple sources, look at your authentication setup, check for recent infrastructure changes, review your recent campaign volume and content, and assess your sending patterns. The category tells us what the fix will look like.

How We Approach Crisis Diagnosis

Here’s what a crisis diagnostic actually looks like. A company calls saying their transactional email started getting delayed 3 hours ago. We pull their IP reputation data and see it’s fine. We check their authentication and it’s correct. We ask what changed in the last 24 hours and they say nothing. We look at their sending volume and see it spiked 5x today compared to yesterday. We ask if that’s normal (it’s not). That’s the problem – volume spike triggered cautious filtering from mailbox providers. Fix: slow down the volume ramp, warm the infrastructure properly, wait for reputation to stabilize. Recovery: 1-2 weeks.

Different case: a company says their marketing email is suddenly going to spam. We check their reputation and see a complaint spike (0.2% baseline, 1.5% in the last 24 hours). We ask what list they mailed and they say they mailed an old subscriber list that hadn’t been mailed in 6 months. Those old subscribers didn’t recognize the mail and complained. That’s the problem – re-engaging inactive subscribers without proper re-engagement workflow. Fix: remove complainers, re-engage inactive subscribers first with preference center or gentle email, warm up before regular mailing. Recovery: 1-2 weeks.

Once we know what broke, we know whether the fix is immediate (hours), medium-term (days), or longer (weeks).

Crisis-to-Recovery Transition

A crisis diagnostic often leads to a rapid scoped engagement. You need the problem fixed fast, and you need to understand whether the underlying damage is temporary and easily fixed, or systemic and requiring real recovery.

We’ve worked through situations where a reputation dip was temporary and resolved within days once we stopped the behavior that caused it. We’ve worked through situations where reputation damage was real and required systematic recovery over 3-4 weeks (monitoring closely, adjusting volume, managing complaints). We’ve identified situations where the “crisis” was actually a single campaign that triggered filters (and every other campaign was fine – restart operations normally and the crisis is over).

The diagnostic clarifies which situation you’re in, what recovery actually requires, and how long it’s going to take.

Pattern Recognition From Experience

Crisis work is where pattern recognition matters most. We’ve seen what happens when volume spikes too fast. We’ve seen what happens when you mail a dormant list. We’ve seen what happens when reputation drops. We’ve seen how Gmail responds to one type of problem versus another. We’ve seen how Outlook’s filtering behaves differently from Yahoo. We’ve seen cases that look like reputation damage but are actually authentication problems. We’ve seen cases that look like list quality issues but are actually sending cadence problems.

When you’re in crisis mode, you need someone who can quickly pattern-match against years of experience and point you toward the real problem (not the obvious-looking problem), so you can fix it fast.

Cost of Crisis vs Cost of Diagnosis

If you’re in crisis, don’t spend days trying to debug this yourself. The cost of misunderstanding a crisis (more mail landing in spam, reputation degrading further, customer impact, lost revenue) often exceeds the cost of a quick diagnostic by orders of magnitude.

A $500 diagnostic that correctly identifies a reputation problem instead of letting you chase a list problem can cost-save a crisis situation by 10-100x. You know what to fix, you know how to fix it, you know how long recovery takes. That beats fumbling around trying random fixes for days.

Get Help Fast

Crisis response is one area where speed matters. The longer a crisis goes undiagnosed and unfixed, the more reputation damage accumulates. The longer mail goes to spam, the more customer impact. The sooner you understand the actual problem, the sooner you can fix it.

We’d love to learn more about your business, email deliverability and outreach goals, and see if we might be able to help.

Whether you have questions about what we do, how Protocol works, or you’d just like to pick our brains on some of our best practices, we’d be happy to chat.

Schedule a call with our Revenue Director, Chrisley Ceme.

Talk To Chrisley

Yes. An active crisis is often how companies find us. Mail that was landing in the inbox consistently is now going to spam. Bounce rates spiked 10x. Complaints jumped from 0.2% to 2%. Engagement dropped sharply – open rates fell by 50% overnight. It happened suddenly, or at least it feels sudden, and you need to understand why it happened and how to fix it fast.

A crisis is actually one of the better times to get consulting because the problem is usually visible. You can see the damage in metrics. You just need to understand its cause so you can fix it.

Rapid Triage

When a deliverability crisis hits, your immediate need is triage: What broke, why did it break, and what’s the immediate fix? This determines whether you’re fixing something today or starting a recovery program.

Most crises fall into one of a few distinct categories:

Reputation damage: Your IP or domain reputation dropped suddenly, triggering filtering or delivery delays. This usually happens after a complaint spike or after suspicious sending activity. You’ll see mail that used to arrive in seconds now delayed by hours, or mail that used to hit the inbox now going to spam.

Configuration change: Something in your infrastructure or sending behavior recently changed, triggering filter response. Maybe you changed ESPs. Maybe you added a new sending IP. Maybe you changed your authentication setup. Maybe your DNS record got corrupted. The change happened, and suddenly everything broke.

Behavior spike: Your sending volume spiked (you ramped from 10k to 100k emails a day), or your complaint rate jumped (people are complaining at rates they weren’t before), or your engagement changed sharply (suddenly fewer people are opening). These behavior changes trigger mailbox provider filters.

List or content issue: You changed your sending list (you switched to a purchased list, or you mailed an old dormant list), or you changed your copy pattern (you started testing new subject lines that trigger spam filters). The change happened, and suddenly filtering increased.

Authentication or infrastructure problem: Something in your technical setup broke. SPF record is broken. DKIM signing stopped working. Your reverse DNS got deleted. An authentication issue that was lurking suddenly became critical.

We can often identify which category you’re in within the first 15-20 minutes. We pull your reputation data from multiple sources, look at your authentication setup, check for recent infrastructure changes, review your recent campaign volume and content, and assess your sending patterns. The category tells us what the fix will look like.

How We Approach Crisis Diagnosis

Here’s what a crisis diagnostic actually looks like. A company calls saying their transactional email started getting delayed 3 hours ago. We pull their IP reputation data and see it’s fine. We check their authentication and it’s correct. We ask what changed in the last 24 hours and they say nothing. We look at their sending volume and see it spiked 5x today compared to yesterday. We ask if that’s normal (it’s not). That’s the problem – volume spike triggered cautious filtering from mailbox providers. Fix: slow down the volume ramp, warm the infrastructure properly, wait for reputation to stabilize. Recovery: 1-2 weeks.

Different case: a company says their marketing email is suddenly going to spam. We check their reputation and see a complaint spike (0.2% baseline, 1.5% in the last 24 hours). We ask what list they mailed and they say they mailed an old subscriber list that hadn’t been mailed in 6 months. Those old subscribers didn’t recognize the mail and complained. That’s the problem – re-engaging inactive subscribers without proper re-engagement workflow. Fix: remove complainers, re-engage inactive subscribers first with preference center or gentle email, warm up before regular mailing. Recovery: 1-2 weeks.

Once we know what broke, we know whether the fix is immediate (hours), medium-term (days), or longer (weeks).

Crisis-to-Recovery Transition

A crisis diagnostic often leads to a rapid scoped engagement. You need the problem fixed fast, and you need to understand whether the underlying damage is temporary and easily fixed, or systemic and requiring real recovery.

We’ve worked through situations where a reputation dip was temporary and resolved within days once we stopped the behavior that caused it. We’ve worked through situations where reputation damage was real and required systematic recovery over 3-4 weeks (monitoring closely, adjusting volume, managing complaints). We’ve identified situations where the “crisis” was actually a single campaign that triggered filters (and every other campaign was fine – restart operations normally and the crisis is over).

The diagnostic clarifies which situation you’re in, what recovery actually requires, and how long it’s going to take.

Pattern Recognition From Experience

Crisis work is where pattern recognition matters most. We’ve seen what happens when volume spikes too fast. We’ve seen what happens when you mail a dormant list. We’ve seen what happens when reputation drops. We’ve seen how Gmail responds to one type of problem versus another. We’ve seen how Outlook’s filtering behaves differently from Yahoo. We’ve seen cases that look like reputation damage but are actually authentication problems. We’ve seen cases that look like list quality issues but are actually sending cadence problems.

When you’re in crisis mode, you need someone who can quickly pattern-match against years of experience and point you toward the real problem (not the obvious-looking problem), so you can fix it fast.

Cost of Crisis vs Cost of Diagnosis

If you’re in crisis, don’t spend days trying to debug this yourself. The cost of misunderstanding a crisis (more mail landing in spam, reputation degrading further, customer impact, lost revenue) often exceeds the cost of a quick diagnostic by orders of magnitude.

A $500 diagnostic that correctly identifies a reputation problem instead of letting you chase a list problem can cost-save a crisis situation by 10-100x. You know what to fix, you know how to fix it, you know how long recovery takes. That beats fumbling around trying random fixes for days.

Get Help Fast

Crisis response is one area where speed matters. The longer a crisis goes undiagnosed and unfixed, the more reputation damage accumulates. The longer mail goes to spam, the more customer impact. The sooner you understand the actual problem, the sooner you can fix it.

Our Revenue Director, Chrisley Ceme, is leading the Triggered Outbound program.Chrisley’s gone deep on this strategy and can walk you through:

  • How Triggered Outbound fits with your outbound goals
  • What triggers are available (and what’s possible within our platform)
  • Pricing, onboarding, and getting started
Talk To Chrisley

Senders Case Studies

See All Case Studies

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