Email Marketing Infrastructure

I’ve talked to 4-5 SDR Leaders that have gotten their email domains TORCHED in the last 2 months. Here’s the thing all outbound teams need to understand about deliverability: Email deliverability is a “death by a thousands paper cuts” type of situation. Stop stacking paper cuts and do these 9 things: 1️⃣ Set up secondary domains If you are still cold emailing off your primary email domain you may be in big trouble. This is crucial. Using something like Maildoso makes getting these domains and the whole technical setup super fast... more on that below. The last thing you want, especially if you DONT have a reputable domain like Salesforce(.)com is to burn your orgs primary domain. This doesn’t just affect your sales team. You don’t need your CSMS and CEO landing in SPAM. 2️⃣ Set up your DNS (DMARC, SPF & DKIM) records for ALL of your domains To skip the manual DNS headache... Maildoso automates this setup. I just set up 2 new domains in literally 1 minute with them last week. Right now we can only set up 2 mailboxes per rep in Outreach. Going to be adding a Smartlead integration soon in Common Room to run higher volume experiments based on various intent signals and double down on the ones that work with human SDRs. 3️⃣ Secondary domains should link to your primary You want to make sure your prospects are being directed to your actual company domain if they are curious and click. 4️⃣ Email Warmup - Domains should be “warmed up” for ~14 days before cold emailing Send at least 20-30 warm up emails per day per email account, with a 40% reply rate. This builds your domain reputation. 5️⃣ Email Volume - Build this over time. Start with 5-10 emails a day per account and do NOT send more than 30 emails per day per email account 6️⃣ Keep your email signature plain text. No Links. No images. No calendar links…at all Add your address in your signature and make sure you put a picture in your Outlook or Gmail profile. 7️⃣ Vary your cold email copy (i.e. SPINTAX). Sending the same template to every prospect signals that you are a spammer. Customize your first step email. For emails further in your sequence, use Spintax. Use alternate phrases “Hi, Hey, Hello”. New age sequencers do this automatically. 8️⃣ Understand that your domain gets TORCHED when people mark your email as spam. Good and relevant copy matter. 9️⃣ Constantly monitor your email deliverability. Deliverability varies across Outlook and Google servers. Get a platform that helps you land in ALL inboxes. Again, Maildoso makes this super easy...  they have daily reputation monitoring built right in so you catch issues fast. They average 98%+ inbox placement - wild. Maintaining good deliverability over time is key in the success of outbound. What would the email deliverability experts add here? #outbound #coldemail #deliverability

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

I burned through $15K perfecting cold email copy. Here's what I learned when I focused on deliverability instead. While I was obsessing over subject lines and CTAs, most of my emails were landing in spam folders. I had killer copy that nobody ever saw. But here's what happened when I fixed the infrastructure piece first… I went from ignored emails to 800,000+ monthly sends at ColdIQ. If your cold emails aren't working, deliverability beats copy every single time. WHY DELIVERABILITY IS EVERYTHING: 1. Perfect copy means nothing in spam. You can have killer targeting, perfect messaging, incredible offers... but if your email lands in spam? Game over. 2. It compounds everything else. Once your domain reputation is down, even your transactional emails start getting flagged and won't get delivered anymore. So how do you make your email in the primary? 1. Protect your main domain. Never send cold emails from your primary domain. We use 70+ secondary domains to keep our brand safe and our main inbox clean. 2. Distribute volume across multiple mailboxes. Set up 140+ mailboxes across those domains. Keep it under 50 sends per day per domain. High volume too early = instant red flag. 3. Get your technical foundation bulletproof. Set up SPF, DKIM, and DMARC authentication. Without proper technical set-up, you're flagged as suspicious by default. 4. Warm up. Send nothing for 2 weeks. Use premium warm-up tools to build trust gradually with ESPs. Ramp slowly to avoid triggering their spam filters. Patience here pays dividends later. 5. Natural variation. Use Spintax or tools like Twain to introduce variations in your messaging. Even small variations help you avoid the repetition triggers that scream "mass email blast" to spam filters. Remember, list quality plus message still matter most. Even with perfect infrastructure, if your list is off and your message is weak, you'll still land in spam. Deliverability gets you to the inbox, but the relevance keeps you there. Monitor everything rigorously. Use tools to track your sender reputation across all ESPs. We check deliverability rates daily (it's that critical). Infrastructure gets you to the inbox, but your targeting plus messaging determines what happens next. I've put together a 7-day GTM crash course that includes our exact setup, authentication templates, and the monitoring systems we use to protect the campaigns of our 70 clients. Reply with "SETUP" if you want access before your next campaign goes live.

100+ cold email stacks audited. Every one under 5% reply broke on the same 10 things. SURBL wasn't one of them. Everyone's panicking about the SURBL blacklist. Our audit says it's not why your emails are in spam - it just exposed the fundamentals that were already broken. Here's the 10-point checklist: 1. Monitor inbox placement weekly ↳ Don't assume you're landing. Validity tracked 16.5% of legit B2B email going to spam in 2026 ↳ Test placement weekly (GlockApps, MailReach, or your sequencer's built-in tool) ↳ Stop guessing. Test the actual placement 2. SPF, DKIM, DMARC ↳ Not optional. Skip it and your spam rate spikes within 2-3 weeks ↳ Run a check with MXToolbox before the next campaign 3. Move DMARC from p=none to p=reject within 90 days ↳ Most teams set p=none and never enforce. Providers flag domains stuck there ↳ p=quarantine after 30 days, p=reject after 90. p=none is the parking spot 4. Secondary domains only, never your primary ↳ Cold sending from your primary is how you burn the domain your business runs on ↳ Buy secondaries. Space the purchases across registrars and days, no same-day batches 5. 2 inboxes per secondary domain ↳ Too many senders on one domain gets it flagged ↳ Want 10 inboxes? That's 5 domains, not 1 domain with 10 mailboxes 6. Warm up 2-4 weeks before the first cold send ↳ A new domain sending 50 cold on day one is a death sentence ↳ Bare minimum 2 weeks. Ideal 3-4. There's no shortcut 7. 5-20 cold emails per inbox per day, no spikes ↳ 200 Monday and 20 Tuesday flags you faster than a steady 20 a day ↳ Consistent low volume beats spikes that burn inboxes 8. Bounce rate under 2% ↳ Above 2% and Gmail starts flagging. Verify 100% of the list before sending ↳ Re-validate any list older than 30 days. Always 9. Plain text only. No HTML, no images, no tracking pixels ↳ HTML reads as marketing to the filters. One image raises your spam rate ↳ If you wouldn't type it as a Slack DM to a coworker, don't send it cold 10. Domain age + clean registration ↳ Nothing under 30 days old in a live campaign ↳ No hyphens, no .net or .info, no bulk buys from a single registrar flagged for abuse Here's what the SURBL scare actually taught us: the teams that panicked had no infrastructure discipline to begin with. The ones who audit weekly barely felt it. SURBL didn't break your deliverability. It just found the cracks that were already there. Infrastructure is 99% of your results. If you're in spam, the copy and the offer don't matter. What's your average bounce rate, spam rate, and inbox placement right now? If you don't know all three, that's the real problem. Repost if someone else needs this ♻

Stop using your company's primary domain for cold outreach. Here's why that's killing your deliverability (and your brand): Your main domain is your reputation. It's where your team communicates. Where customers email you. Where partners reach out. One bad cold email campaign can torch that reputation. Forever. When you cold email from your main domain: → Every bounce damages sender reputation. → Every spam complaint hurts your primary domain. → Every risky campaign puts your whole company email at risk. Then one day, your CEO's emails start landing in spam. Your support team's responses get filtered. Your invoices disappear. All because you tried to save $12/year on a separate domain. The better approach is to buy a secondary domain for cold outreach. Similar to your main domain, but slightly different. • Main: company.com → Cold: getcompany.com • Main: acme.com → Cold: acmeteam.com • Main: brand.com → Cold: trybrand.com Keep them related but separate. → Your main domain stays clean. If something goes wrong with cold email, your primary communications are protected. → You can test aggressively. Try new campaigns. Scale quickly. Without risking your core business operations. If a cold domain gets flagged, you can switch to a new one without touching your main brand. "But people won't trust emails from a domain they don't recognize!" If your cold email is good, they won't care. They care about the value you're offering, not whether you're using .com or .io. And if they do care that much, they weren't going to respond anyway. The setup: 1️⃣ Buy a secondary domain ($12-15/year) 2️⃣ Set up proper DNS records (SPF, DKIM, DMARC) 3️⃣ Warm it up for 2-3 weeks before sending 4️⃣ Keep your sending volume conservative 5️⃣ Monitor deliverability separately from your main domain The cost of not doing this: One bad campaign. One blacklist. One spam complaint spiral. Your entire company's email reputation destroyed. Is that worth saving $12/year? Separate your domains. Protect your brand. Are you using a separate domain for cold outreach? Or risking your main domain?

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?

The silent killer of outbound campaigns isn't bad copy—it's poor inbox deliverability with no fall-back. Most SaaS companies operate with a single sending domain, creating a single point of failure for their entire pipeline. Here's what the top 10% of outbound teams implement: 1. Primary domain (used for most company communications) 2. Secondary domains (warmed 2-6 weeks before campaign use) - Different IP and domains than primary - SPF/DKIM/DMARC records - Routine inbox placement + blacklist monitoring  3. Tertiary backup domains (fully warmed but unused) - Complete isolation from domains 1 & 2 - Ready for immediate deployment if needed This three-domain architecture creates redundancy. It'll protect against deliverability disasters when algorithms change. It takes about a month to fully prepare—but it's insurance against the most common outbound failure: sudden email reputation collapse. The companies that use this architecture survive even in the roughest of times.

“Email isn’t working like it used to.” Sales leaders tell me this all the time. Their teams are struggling to hit quota, blaming email. But a few simple questions reveal why. — Sending from? "Outreach / Apollo / HubSpot" — Main domain? "Yes." — Emails per rep/day? "250." (8-15 reps) — Signature? "1 image, 4 links." — Copy? "Calendar link, hard CTA, use case link." — Who handles deliverability? "No one. IT when accounts get suspended." — Tracking opens/clicks? "Of course! How else would I know deliverability is bad?" — Warming up mailboxes? "What’s warm-up?" — Data source? "Apollo’s "verified" data." 🚩 A major red flag walking. This worked in 2019, maybe early 2023. But now? → ESP filters are brutal → Reps are torching their main domains → Their emails scream automation and get filtered instantly → They’re tracking opens/clicks—metrics that died with Google & Outlook → They’re not even warming up mailboxes → Their data is the same overused, hammered-to-death junk And the worst part? They don’t even realize it. Here’s what actually works: Use secondary domains – Protect your main one. ↳ Buy on Cloudflare Track only replies – Opens/clicks kill inboxing. ↳ Turn off anything that isn't reply rate Cap sending at 30/day per mailbox – More domains, lower volume. ↳ Stop sending too many emails per mailbox/domain Warm up mailboxes ↳ Bare minimum: Instantly.ai. Best: Warmy.io - Email channel. Reliable. Double-verify lists. Bad data = bad reputation. ↳ Use LeadMagic and Emailable Use an SEP built for TODAY’s deliverability – Not outdated playbooks. ↳ Go with Instantly.ai, Smartlead or EmailBison — Cancel Outreach/Salesloft Worried about CRM Data sync? ↳ Let OutboundSync update your Hubspot or SFDC automatically No links. No images. Plain text only. – Avoid spam filters. ↳ Get into the inbox first, that's all that matters Email still works. Just not the way it used to.

Most people have no idea how to calculate how many domains they need. They just throw money at the problem. Here’s the actual math that every serious cold emailer should know: ➞ 75 emails per day per domain is the safe average. ➞ Want to send 350 emails per day? You need at least 5 domains. ➞ If you’re targeting enterprise accounts with security filters (IE Barracuda, Proofpoint), cut that number in half. ➞ If your TAM is 6,000 accounts, aim to cover it in 3-6 months, then adjust based on response rates. But the biggest issue isn’t just the number of emails.  It’s how you manage domain health. Here's how to Keep Your Domains Healthy: 1. Warm up every domain properly.  You can’t just buy 10 domains and start blasting emails.  Use tools like Smartlead, Lemwarm, or Instantly to slowly ramp up sending over weeks. 2. Rotate domains automatically.  Never send all emails from one domain.  Set up automatic rotation so each domain gets an even share of traffic. 3. Monitor deliverability constantly.  Check if emails are landing in spam, monitor open rates, and test with inbox placement tools. 4. Have backup domains ready.  If one domain gets flagged, you don’t want to pause campaigns while setting up new ones.  Always have extra warmed-up domains available. 5. Use high-quality email copy.  Gmail and Outlook track engagement—bad emails with high bounce rates and low responses will tank your sender reputation. **And the biggest mistake?  Not having backup domains. If you’re serious about deliverability, you should double your domains so you have extras ready when (not if) one burns out.