Best practices for deliverability

Sending well is mostly about not looking like spam to receiving servers. The platform handles the heavy infrastructure pieces (DKIM signing, List-Unsubscribe headers, plain-text fallback, batching) — these tips cover what you control.

Use a verified custom domain whenever possible.
Mail from [email protected] works, but receivers weight your-domain mail higher. A verified send.yourdomain.com sender with passing DKIM/SPF/DMARC will land in inboxes that platform-shared senders may not.

Write subjects that look human.
Avoid all-caps, lots of punctuation ("!!!"), and obvious spam phrases ("FREE!!! ACT NOW"). Subjects that read like a personal message ("a quick update from the team") consistently outperform marketing-speak.

Use the preheader.
The line just below the subject in inbox previews. A good preheader gives context that pulls the recipient into opening — leaving it blank wastes valuable inbox real estate.

Keep your tag-targeting tight.
Sending to "everyone" is a deliverability mistake even when technically allowed. Tag intentionally and target the campaign to people who've actually opted to receive it. Mailing dormant contacts is the fastest way to spike spam complaints.

Mind your image:text ratio.
All-image emails (like a flyer dropped in as one big image) trip spam filters. Mix in real text blocks. The platform also generates a plain-text version of every email automatically, so your blocks should still make sense if rendered as text.

Watch the suppression count.
A growing suppression list is normal. A sudden spike after one campaign is a signal — something about that send (subject, audience, frequency) was off. Pull back before sending the next one.