3 Things That Kill SMB Cold Email Campaigns (And How to Fix Them)

November 4, 2025

Most small and mid-size companies know they should be doing outbound. The problem is they treat it like a "set it and forget it" project—and then wonder why nothing happens.

Here are the three things that go wrong most often:

1. They launch once and never touch it again

You build a list, write five emails, schedule them out, and move on. Some time later, you check the dashboard and the results are... underwhelming.

Here's why: Lists go stale. People change jobs. Your messaging stops resonating because the market shifted. Cold email isn't a campaign—it's a system that needs maintenance.

How to fix it: Set a monthly (or more frequent) review. Are people still at these companies? Is your offer still relevant? Has anything changed in your market that you should address in your messaging? Refresh your lists every 30-45 days and rewrite at least one email based on what's actually getting responses.

2. They focus on volume and ignore deliverability

Sending 500 emails a day sounds productive until you realize half of them are landing in spam or getting bounced. The issue isn't your copy—it's that you didn't set up your sending infrastructure properly, or you ramped up too fast.

This is where most SMBs lose the game before it even starts. Your domain reputation matters. Your authentication (SPF, DKIM, DMARC) matters. Your warm-up process matters.

How to fix it: If you're serious about outbound, invest in the setup. Use a dedicated sending domain (not your main company domain) that isn’t new, as new domains tend to perform poorly. Warm it up gradually—start with 20-30 emails a day for two weeks, then scale. Monitor your bounce rate and spam complaints religiously. If you're above 2% bounce rate, stop and fix your list quality.

3. They don't learn from what's working (or not working)

You finish a campaign, glance at the stats—"okay, 3% reply rate"—and then... nothing. You don't dig into which subject lines worked, which personas responded, or why certain messages got ignored.

Without a feedback loop, you're just guessing over and over again. And your results stay flat.

How to fix it: After every 200-300 emails, do a mini-audit. What subject lines got the best open rates? Which CTAs got replies? Did any specific industries or company sizes respond more? Use that data to tweak your next batch. Cold email gets better when you treat it like a learning process, not a one-and-done task.

Bottom line: Outbound works for SMBs when you treat it like a discipline, not a shortcut. Keep your lists fresh, protect your sending reputation, and actually learn from your results.

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

Most small and mid-size companies know they should be doing outbound. The problem is they treat it like a "set it and forget it" project—and then wonder why nothing happens.

Here are the three things that go wrong most often:

1. They launch once and never touch it again

You build a list, write five emails, schedule them out, and move on. Some time later, you check the dashboard and the results are... underwhelming.

Here's why: Lists go stale. People change jobs. Your messaging stops resonating because the market shifted. Cold email isn't a campaign—it's a system that needs maintenance.

How to fix it: Set a monthly (or more frequent) review. Are people still at these companies? Is your offer still relevant? Has anything changed in your market that you should address in your messaging? Refresh your lists every 30-45 days and rewrite at least one email based on what's actually getting responses.

2. They focus on volume and ignore deliverability

Sending 500 emails a day sounds productive until you realize half of them are landing in spam or getting bounced. The issue isn't your copy—it's that you didn't set up your sending infrastructure properly, or you ramped up too fast.

This is where most SMBs lose the game before it even starts. Your domain reputation matters. Your authentication (SPF, DKIM, DMARC) matters. Your warm-up process matters.

How to fix it: If you're serious about outbound, invest in the setup. Use a dedicated sending domain (not your main company domain) that isn’t new, as new domains tend to perform poorly. Warm it up gradually—start with 20-30 emails a day for two weeks, then scale. Monitor your bounce rate and spam complaints religiously. If you're above 2% bounce rate, stop and fix your list quality.

3. They don't learn from what's working (or not working)

You finish a campaign, glance at the stats—"okay, 3% reply rate"—and then... nothing. You don't dig into which subject lines worked, which personas responded, or why certain messages got ignored.

Without a feedback loop, you're just guessing over and over again. And your results stay flat.

How to fix it: After every 200-300 emails, do a mini-audit. What subject lines got the best open rates? Which CTAs got replies? Did any specific industries or company sizes respond more? Use that data to tweak your next batch. Cold email gets better when you treat it like a learning process, not a one-and-done task.

Bottom line: Outbound works for SMBs when you treat it like a discipline, not a shortcut. Keep your lists fresh, protect your sending reputation, and actually learn from your results.

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

Subscribe to our newsletter

Arrow
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

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