Email Deliverability: Making Sure Your Emails Reach the Inbox

You can write a brilliant email, but if it lands in the spam folder, none of it matters. Deliverability is the often-ignored foundation of email marketing — the set of factors that decide whether your messages reach the inbox or get filtered out.

The good news is that most deliverability problems are avoidable with a few sensible habits. This guide explains why emails get blocked and what keeps you in good standing with the inbox providers.

Authenticate your domain

Inbox providers want proof that you really are who you claim to be. Three technical records — SPF, DKIM and DMARC — authenticate your emails and tell providers your messages are legitimate. Without them, you look suspicious, and major providers increasingly require them.

These are set up once in your domain’s DNS settings. It sounds technical, but it’s a one-off job and it’s now essential rather than optional. If you’re sending marketing email without authentication in place, fixing it is the first thing to do.

Keep your list clean and engaged

Providers judge you partly on how people react to your emails. High open and click rates signal a wanted sender; lots of spam complaints, bounces and ignored messages signal the opposite. So a clean, engaged list is a deliverability asset, not just a marketing one.

Only email people who genuinely opted in, remove hard bounces promptly, run re-engagement campaigns to prune the inactive, and make unsubscribing easy. Buying lists or emailing people who never asked is the fastest route to the spam folder.

Habits that build a good reputation

Send consistently rather than in sudden huge bursts, especially from a new domain — a sender reputation is built gradually. Avoid spam-trigger behaviour like misleading subject lines, all-caps shouting and image-only emails with no text.

Monitor your results: a sudden drop in opens or a rise in bounces is an early warning. Treat deliverability as ongoing maintenance, and your carefully written emails will actually get the chance to be read.