Topic

Business email.

When mail stops arriving there is no error, no dashboard turning red, and no moment at which it happens. There is only silence, and silence is easily mistaken for a slow month.

3 areas · 30 pages

SPF, DKIM and DMARC

The three records that decide whether your mail arrives and whether anyone can impersonate you.

7 pages

Deliverability

Why messages get filtered, and why testing it yourself confirms it works.

3 pages

Provider setup

The exact records each provider needs, and the mistake specific to each.

20 pages

Start here

The pages worth reading first.

No DKIM signature was found.

DKIM lets a receiving server verify a message really came from you. How to publish it and why keys stop matching.

My DMARC is rejecting my own mail.

A strict policy plus an unauthorised sender means your own mail is being rejected on your own instructions.

Anyone can send email pretending to be you.

Without DMARC, receiving servers have no instruction about forged mail from your domain. How to publish it safely.

My SPF record has too many lookups.

SPF allows ten DNS lookups. Past that the whole record fails silently while still looking correct.

There is no SPF record.

Nothing tells receiving servers which systems may send mail for your domain. How to publish one that works.

What breaks business email.

Mail failing produces no error on your side. Why quotes go unanswered, what actually breaks, and how to tell.

Check yours

See where your domain stands.

The free check covers all of this at once, in about ten seconds. No account, no card.