Custom Email Domain missing DKIM records

I have set up a couple of domains for icloud's custom email for domain following instructions as found https://support.apple.com/en-gb/HT212524. This includes setting up a CNAME record for the domain to point at the canonical DKIM record controlled by Apple. eg. a custom domain of 'foobar.uk.' should have a CNAME record 'sig1._domainkey.foobar.uk.' pointing to 'sig1.dkim.foobar.uk.at.icloudmailadmin.com.'

From the support document for a domain 'example.com':

CNAME:

host: sig1._domainkey

points to: sig1.dkim.[example.com].at.icloudmailadmin.com.

TTL: 3600

Unfortunately I cannot retrieve any records from the target (canonical) address: eg.

dig sig1.dkim.[example.com].at.icloudmailadmin.com. TXT

dig sig1.dkim.foobar.uk.at.icloudmailadmin.com. TXT

Clearly 'foobar.uk' is not my real domain, but I have 2 domains set up with Apple and neither has a valid DKIM record.

Anyone else?

Posted on Oct 6, 2021 2:32 AM

Top-ranking reply

l.fromgeneva

Level 1

30 points

Posted on Mar 4, 2022 7:52 AM

I just sent a test email from Mac Mail app using my custom domain to a Gmail account.

The summary at the top of the "show original" now has this entry:

SPF:PASS with IP 17.58.63.177

DKIM: 'PASS' with domain mydomain.tld

Where are few weeks ago, only the SPF line was there.

Additionally, there's also the "DKIM-Signature" line further down.

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mydomain.tld; s=sig1; t={redacted}; bh={redacted}; h=From:Content-Type:Mime-

This wasn't there a few weeks ago either.

When you send from an iCloud address, though, you get this:

SPF:PASS with IP 17.58.63.184

DKIM:'PASS' with domain icloud.com

DMARC:'PASS'

So things are looking better for sure.

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Custom Email Domain missing DKIM records

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