Avoid Getting Banned from Inboxes

After reviewing data from 1,000s of inboxes at RevGrowth, these 8 practices have made the biggest impact for consistent 99% email deliverability:   Most teams skip at least one of these, then wonder why their cold emails land in spam.   Here's what we do:   1. Use Secondary Domains - Never send from your main domain > We buy secondary domains through Porkbun for cheap, easy management   2. Track Replies Only - Open and click tracking hurt deliverability > I keep reply tracking on and turn everything else off. Clean signal, less risk   3. Send Fewer Emails Per Mailbox - I stick to 30 emails/day per mailbox, max > Spread your volume across several domains. Fewer red flags, more consistency   4. Warm Up Slowly - Ramp up sending volume over time. > Start low, increase gradually. This builds trust with inbox providers.   5. Double-Verify Your Lists - Bad data kills sender reputation > We use LeadMagic, Icypeas, and Prospeo.io for email search, then verify with LeadMagic. Clean lists = low bounce rates   6. Use Modern Sending Platforms - Old-school SEPs drag down deliverability > I recommend EmailBison or Smartlead   7. Automate CRM Syncing - Manual updates cause errors and missed follow-ups. > OutboundSync handles real-time syncing with HubSpot or Salesforce. Less manual work, more accuracy.   8. Stick to Plain Text - Links and images lower inbox rates. > I write text-only emails. They look more human and get better placement.   Our team applies these 8 steps in every workflow ourselves & all client accounts.   What’s been your biggest deliverability challenge lately?

You can craft the most creative messaging and have the best targeting in the world, but if you can't land in the inbox - your efforts will be wasted. I've outlined 8 steps for top notch email deliverability: After reviewing data from 10,000+ inboxes, these are the practices RevGrowth trusts for safe, consistent inbox placement. Most teams skip at least one of these, then wonder why their cold emails land in spam. Here’s how we set up every outbound campaign: 1️⃣ Use Secondary Domains → Never send from your main domain. ↳ We buy secondary domains through Cloudflare for extra security and easy management. 2️⃣ Track Replies Only → Open and click tracking hurt deliverability. ↳ We keep reply tracking on and turn everything else off. Clean signal, less risk. 3️⃣ Send Fewer Emails Per Mailbox → We stick to 30 emails/day per mailbox, max. ↳ Spread your volume across several domains. Fewer red flags, more consistency. 4️⃣ Warm Up Slowly → Ramp up sending volume over time. ↳ Start low, increase gradually. This builds trust with inbox providers. 5️⃣ Double-Verify Your Lists → Bad data kills sender reputation. ↳ We use LeadMagic, Icypeas, and Prospeo.io for initial cleaning, then double-check with BounceBan (Verify risky emails without sending messages). Clean lists = low bounce rates. 6️⃣ Use Modern Sending Platforms → Old-school SEPs drag down deliverability. ↳ We recommend Instantly.ai, Smartlead, or EmailBison. 7️⃣ Automate CRM Syncing → Manual updates cause errors and missed follow-ups. ↳ OutboundSync handles real-time syncing with HubSpot or SFDC. Less manual work, more accuracy. 8️⃣ Stick to Plain Text → Links and images lower inbox rates. ↳ We write text-only emails. They look more human and get better placement. Email is not dead. But the rules have changed. You need the right setup and clean data, not just good copy. I keep these 8 steps in every workflow for all of our client accounts. What’s been your biggest deliverability challenge lately?

One of the most common pain points I hear from GTM leaders is that their outbound emails are going to spam. Good news. This is easily avoidable. At Unify, our customers send tens of thousands of emails per month with no deliverability issues. Here are the 7 best practices I’d recommend for ramping up outbound email and avoiding spam/deliverability issues: 1) Email prospects who actually want to hear from you. This should go without saying, but you need to email people who could benefit from your product. If you start just spamming people who have no use for your product, never will, et cetera, you're setting yourself up for email deliverability issues. Even if you technically “could” do it, spray and pray will not deliver results. 2) Use multiple mailboxes per sender. You’ll want to have multiple mailboxes per sender. How many? Best practice here is to have anywhere between 5-10. This inbox count is usually safe to keep sends per inbox at a reasonable level. 3) Send emails from non-core domains. It’s important to have several domains that you can deliver emails from. We send most of our volume through unifygtm.io and unifygtm.co. While we also send outbound emails from unifygtm.com, having alternative domains spreads out the volume and keeps our core domain safe. 4) Warm your inboxes Using a warm-up service will simulate healthy conversation between different mailboxes. You should warm your inboxes for 45-60 days before sending real emails through them. Pro-tip: If you run into deliverability issues as you ramp up your outbound email motion, turn warming back on to improve deliverability health. 5) Nail your IP address setup. You’ll want to send from Non-Gmail IPs. Moving sends to a platform like Sendgrid or Unify managed IPs keeps your deliverability in check. IP addresses are as important as the domain that you deliver from. 6) Keep Volume Reasonable In 2024 it’s important to keep send volume per mailbox reasonable. My current recommendation: Keep your volume of sends between 50-75 a day. If you do need more, then create additional mailboxes. 7) Personalize Emails 1:1 Please, make sure you’re not sending the same generic message over and over. This is an easy way to get picked up as spam by ISPs. Prospects expect a personalized experience, and your outbound will perform better if it is truly personalized (this can be fully automated btw—but that’s a topic for a different post). Question for anyone else deep in email deliverability: what else would you add to this list? Anything I’m missing here? Let me know in the comments.

How I Fixed My Cold Emails A few months ago, I spent hours writing cold emails—personalizing them, finding leads, and making sure everything was perfect. But when I sent them? Almost no replies. The problem? My emails weren’t even landing in the inbox. Most were going straight to spam. Here’s what I did to fix it: 🔹Set Up Secondary Domains Using extra domains helped protect my main one and improved my sender reputation. 🔹Fixed My Email Settings Setting up DMARC, DKIM, and SPF (fancy terms, I know) made my emails look more trustworthy to inbox providers. 🔹Warmed Up My Mailboxes Instead of sending tons of emails right away, I started small and gradually increased volume. This helped me avoid spam filters. Then I found Maildoso , and everything changed. It automated these steps and took my inbox rate to 99.9%. Now, I get more replies and better results from my outreach. If you’re struggling to get your cold emails noticed, focus on deliverability first—it makes all the difference. What’s been your biggest challenge with cold emails? Let me know below! #ColdEmail #EmailMarketing #Deliverability #Maildoso