Deliverability
Authentication, reputation and the reasons mail does not arrive.
Toll free verification: get an SMS number approved
Toll free verification is the check carriers make before a toll-free number may text: what it asks for, how long review takes, why it fails and how to fix it.
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 (2026 Full Guide)
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 (2026 Full Guide)
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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