Cold Emails Going to Spam? 7 Fixes That Work - LeadGrow AI

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1. Too many links. One link maximum in cold emails. Two at the absolute most (one in body, one in signature). Every additional link increases your spam score. Tracking links from your sending tool count as links. “Cold emails should look like emails a person would type. Not marketing newsletters with images, buttons, colored backgrounds, and custom fonts. Plain text or minimal HTML only.” Images in cold emails. Adding images to a cold email is almost always a mistake. Images increase email size, trigger HTML rendering, and often contain tracking pixels that spam filters flag. If you need to share something visual, link to it.

   In Cold email formatting

2. Across our 1,626+ campaigns, the benchmarks for healthy deliverability are: “Inbox placement rate: 90%+ (this means 90% or more of your emails land in the primary inbox, not spam or promotions)” Bounce rate: Under 3%

   In Email deliverability benchmarks

3. Inbox placement rate: 90%+ (this means 90% or more of your emails land in the primary inbox, not spam or promotions) “Bounce rate: Under 3%” Spam complaint rate: Under 0.1%

   In Email deliverability benchmarks

4. Bounce rate: Under 3% “Spam complaint rate: Under 0.1%” Authentication pass rate: 100% (SPF, DKIM, and DMARC all passing on every email)

   In Email deliverability benchmarks

5. Fix 4: Eliminate content spam triggers “Authentication, warmup, and volume are the big three. If those are all clean and you're still seeing spam placement, content is the next place to look.” Spam filters analyze email content for patterns associated with spam. Some triggers are obvious (all caps subject lines, excessive exclamation marks). Others are subtle.

   In Inbox placement and spam filters

6. Never turn warmup off completely. Even during active sending, keep warmup running at a reduced rate in the background. “If a domain has been sending cold email and starts hitting spam, reduce cold sends and increase warmup volume for 1 to 2 weeks.” The most common warmup mistake: impatience. We see teams buy 10 domains on Monday and start blasting campaigns on Wednesday. Two weeks later, every domain is flagged. The 21 to 28 day warmup period exists because reputation building takes time. There's no shortcut. For the full protocol, see our email warmup guide.

   In Mailbox warm-up

7. This is the biggest misconception in cold email. A campaign underperforms. Reply rates are low. Open rates are suspiciously low. The instinct is to rewrite the email, change the subject line, add more personalization, try a different angle. “Authentication, domain reputation, sending volume, warmup status.” Here are 7 fixes that actually work. In order of priority.

   In Spam complaint management

8. This is the biggest misconception in cold email. A campaign underperforms. Reply rates are low. Open rates are suspiciously low. The instinct is to rewrite the email, change the subject line, add more personalization, try a different angle. “infrastructure first, copy second. Always.” Here are 7 fixes that actually work. In order of priority.

   In Spam complaint management

9. This is the first thing to check. Every time. Without exception. “Three DNS records need to be configured correctly on every domain you send from: SPF, DKIM, and DMARC.” SPF (Sender Policy Framework) tells receiving servers which mail servers are authorized to send from your domain. Without it, your emails look like they could be from anyone pretending to be you.

   In Spam complaint management

10. Re verify lists that are older than 90 days before sending to them again. “Use waterfall enrichment (multiple data providers) to get the highest accuracy email addresses from the start.” Fix 7: Handle unsubscribe compliance

    In Waterfall enrichment