Deliverability
Deliverability guides and product notes — no filler.
Set up SPF, DKIM, and DMARC in AWS Route 53
Publish SPF, DKIM, and DMARC as TXT records in AWS Route 53 — where to add each record, the fully-qualified naming, and the 255-character DKIM split.
How to set up SPF, DKIM, and DMARC in Squarespace
Set up SPF, DKIM, and DMARC in Squarespace Domains: where the DNS editor lives and what to enter in the Host field for each TXT record.
How to set up SPF, DKIM, and DMARC in Wix
Set up SPF, DKIM, and DMARC in Wix: where the DNS editor lives, what to enter for @, _dmarc, and your DKIM selector, plus the pointed-domain trap.
Email sender reputation explained
Sender reputation is the score each mailbox provider keeps on you. What moves it, how to check it provider by provider, and how to protect and repair it.
How to set up SPF, DKIM, and DMARC in Bluehost
Set up SPF, DKIM, and DMARC in Bluehost: find the DNS editor, add each TXT record with the right host, and merge SPF instead of a duplicate.
How to set up SPF, DKIM, and DMARC in Hostinger
Set up SPF, DKIM, and DMARC in Hostinger's hPanel DNS editor: where each TXT record goes, what to enter in the Name field, and how to verify it.
How to set up SPF, DKIM, and DMARC in IONOS
Set up SPF, DKIM, and DMARC in IONOS: where the DNS editor is and what to enter in the host field for the root, _dmarc, and DKIM selector.
How to set up SPF, DKIM, and DMARC in Porkbun
Add SPF, DKIM, and DMARC records in Porkbun's DNS editor. Exactly what goes in the Host and Answer fields for each TXT record, in the right order.
SPF, DKIM, and DMARC explained
SPF, DKIM, and DMARC are the DNS records that prove your mail is really yours — and mandatory for bulk senders since 2024. What each does, explained.
How to improve email deliverability
How to improve email deliverability: the seven levers that decide inbox vs spam — authentication, list hygiene, engagement, reputation, warmup, and more.
What are spam traps, and what can verification do about them?
Spam traps punish poor list hygiene, and no verifier can reliably detect one. The three trap types, why detection fails, and what actually protects you.
What is greylisting? Why honest verifiers say unknown
Greylisting makes mail servers say "try again later" to unfamiliar senders. What that does to email verification, and why honest tools return unknown.