GTM Playbooks

Why cold outreach lands in spam, and how to fix it

7 min read
Quick answer

A lot of outbound never reaches a human. It lands in spam because of how it was sent, not just what it said. Fixing deliverability is about reputation, sending patterns, and measuring real replies instead of opens.

Reaching the inbox is half the battle

You can write the best message in the world, but if it lands in spam, none of it matters. Deliverability is the quiet reason many outbound programmes underperform, and most teams never see it because their reports show sends, not landings.

Domain and sender reputation

Mailbox providers decide where your message goes based on trust. New domains, missing authentication, and a history of complaints all push you toward spam. Warming up senders and keeping authentication clean protects that trust.

Volume and patterns

Blasting thousands of identical emails from one domain is the fastest way to get filtered. Sending in human sized batches, with natural variation, keeps your patterns from looking like a machine.

What is in the message

Heavy links, large images, spam trigger words, and broken formatting all hurt. A plain, well written message that reads like a person wrote it does better, in the inbox and with the reader.

Measure replies, not opens

Open tracking is broken because of how mailboxes now load images, so open rates lie. The honest signals are replies, meetings booked, and bounce rates. Build your view of what works on those.

Common questions

Why are my open rates so high but replies so low?

Open tracking is unreliable, so a high open rate can be a false reading. Trust replies and meetings instead.

Should we use one domain or several?

Spreading sending across healthy domains and senders, in reasonable volumes, protects reputation better than one heavy domain.

Does personalisation help deliverability?

Yes. Varied, human sounding messages look less like bulk mail, which helps you reach the inbox.

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