Deliverability
Authentication, reputation and the reasons mail does not arrive.
Custom return path: why your bounces need it
What the return path is, how it differs from the From header, why a return path on your own subdomain makes SPF count toward DMARC, and the records it needs.
Email suppression list: what it is, how to use it
What goes on an email suppression list, which entries block receipts and password resets, what a suppressed send returns, and how to manage it by API.
DKIM, SPF and DMARC explained: what to publish
What SPF, DKIM and DMARC each check, how to read the verdicts on a sent message, the records to publish, and what Gmail and Outlook.com require of senders.
Hard bounce vs soft bounce: what to do with each
A hard bounce is permanent, a soft bounce temporary. How to tell them apart by the enhanced status code, what Rasket suppresses for you, and what is up to you.
Email deliverability guide: inbox, not spam
Delivered is not inboxed: the records, list habits and sending pace that reach the inbox, a checklist for non-developers, and what to do when mail hits spam.
Email domain verification, step by step
Which DNS records verify a sending domain, where each one goes, how long it normally takes, and what each status on the domain page tells you to do next.
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