SPF, DKIM and DMARC for Mailjet

Short answer: Mailjet mail passes Gmail, Yahoo and Microsoft checks when you turn on DKIM with your own domain, add include:spf.mailjet.com to your one SPF record and publish a DMARC record at _dmarc (start with p=none). The exact records and clicks are below.

SPF	TXT at `@`	v=spf1 include:spf.mailjet.com ~all Mailjet's own value is `v=spf1 include:spf.mailjet.com ~all`. Already have an SPF record? Merge the include into it. Mailjet's default bounce address is on Mailjet's domain, so DMARC usually passes through DKIM, not SPF.
DKIM	CNAME / TXT	TXT record at `mailjet._domainkey` with the key from your account (it starts with `k=rsa; p=`). The key is unique to your domain.
DMARC	TXT at `_dmarc`	v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.com Start with `p=none` and a mailbox you read, or a free report address that turns the reports into a dashboard; build your own.

Step by step

In Mailjet open Account settings → Domains & Sender addresses, click the cog next to your domain and choose Validate; add the validation TXT record it shows.
Open SPF/DKIM Authentication → Setup SPF/DKIM Authentication for the domain.
Add the DKIM TXT record at mailjet._domainkey and the SPF include to your one SPF record at @.
Back in Mailjet click refresh: it doesn't re-check DNS on its own. Green checks mean you're done.
No DMARC record yet? Publish one at _dmarc with p=none.

Mistakes that break it

Some DNS panels add your domain to the host field automatically: check the saved name isn't mailjet._domainkey.yourdomain.com.yourdomain.com.
Some panels want the long key in double quotes, and a few truncate 2048-bit keys. Then regenerate a 1024-bit key in Mailjet (only possible once the whole domain is validated).
Two records starting with v=spf1 make SPF fail. Keep one.

Check that it worked

After the fix, keep an eye on it: free DMARC monitoring shows every service that sends mail as your domain and which ones fail, in plain English.

Rather not touch DNS? I set up SPF, DKIM and DMARC without breaking your other senders, with a before/after report.

Get it fixed on Fiverr

Prefer to do it yourself? Get the step-by-step Fix Kit ($15) – 19-page guide, checklist, 20+ providers.

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