Why are my emails going to spam?

Cold email lands in spam for eight common reasons. In rough order of frequency: email authentication isn't resolving, the sending domain is too new, list quality is producing bounces, recipients are complaining, volume ramped too fast, the domain or IP is blocklisted, engagement is too low, or the content pattern looks like spam. Work through them in that order — authentication is both the most common cause and the fastest to fix.

Diagnose it first

Before changing anything, run these checks. They take five minutes and will tell you which of the eight causes you actually have.

Then open mailbox health in 11x analytics. Deliverability problems are often isolated to one mailbox that's dragging the whole domain down.

Cause 1 — Authentication isn't resolving

The most common cause by a wide margin. SPF, DKIM, and DMARC must all resolve for your sending domain. Adding the DNS records isn't the same as them working — typos, wrong hostnames, multiple conflicting SPF records, and un-propagated changes are all routine.

Fix: see Set up SPF, DKIM, and DMARC. Fixed within hours once DNS propagates.

Cause 2 — The sending domain is too new

A new domain has no sending reputation. Mailbox providers treat sudden volume from an unknown domain as a spam signal, and there's no history to weigh against it.

Fix: warm the domain up — ramp volume gradually rather than starting at target rate. See How to warm up a new sending domain. Takes weeks, not hours.

Cause 3 — List quality is producing bounces

A high bounce rate is a direct reputation signal. Invalid addresses, catch-all domains, and stale contact data all contribute.

Fix:

• Let Alice source contacts from the verified database rather than uploading unvalidated lists
• Remove any list you can't vouch for the age of
• Enable the Qualification Agent so out-of-profile prospects never get sent to in the first place

Cause 4 — Recipients are complaining

Spam complaints are the most damaging signal there is. They usually mean you're reaching people who aren't remotely in your market, not that your copy is bad.

Fix: tighten your ICP before you touch your copy. A well-targeted mediocre email outperforms a brilliant email sent to the wrong person. See Set up Alice → define your ICP.

Cause 5 — Volume ramped too fast

A sharp increase in send volume looks like a compromised account, even on a domain with good history.

Fix: let the Deliverability Engine pace volume. If you've increased volume manually, drop back to the previous level and ramp more gradually.

Cause 6 — The domain or IP is blocklisted

Check with the blacklist checker. Blocklisting is usually the consequence of causes 3, 4, or 5 rather than an independent problem.

Fix: resolve the underlying cause first, then request delisting. Delisting without fixing the cause gets you relisted.

Cause 7 — Engagement is too low

Mailbox providers weigh opens, replies, and positive actions. Mail that nobody engages with gradually stops reaching inboxes even without complaints.

Fix: improve relevance rather than volume. This is a knowledge base and ICP problem — see Set up Alice → build the knowledge base. Thin inputs produce generic messages, and generic messages don't get replies.

Cause 8 — Content and link patterns

Less influential than most people assume, but it still matters at the margin: heavy link counts, link shorteners, large images, tracking-heavy templates, and attachments in a first touch.

Fix: keep first-touch emails plain and text-forward. Avoid shorteners entirely.

Fix them in this order

How long recovery takes

Next steps

Still need help

Email support@11x.ai with your sending domain, the results of the domain health check, and your current bounce and complaint rates.