DKIM for iCloud+ Custom Email Domain
iCloud+ Custom Email Domain uses the selector sig1. Enter your domain and sig1 below to check the key is published.
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Examples:
DKIM Checker
iCloud+ Custom Email Domain DKIM
Selectorsig1
Record Namesig1._domainkey.yourdomain
Check From a Terminaldig +short TXT sig1._domainkey.example.com
SPF and Set-Upfrabs.net/tools/spf-checker/icloud-mail/
Mail from iCloud+ Custom Email Domain carries a DKIM-Signature header with s=sig1 (or another selector the provider shows for your domain). Receivers fetch the public key from sig1._domainkey on your domain to check it.
If the record is a CNAME, the provider hosts the key and can rotate it for you; keep the CNAME exactly as given.
DKIM by Provider
Google WorkspaceMicrosoft 365Namecheap Private EmailFastmailProton MailiCloud+ Custom Email DomainSendGridResendMailchimp
Questions
What is the DKIM selector for iCloud+ Custom Email Domain?
sig1, unless your admin panel shows a different one for your domain.
Why does DKIM still fail?
Signing must also be switched on in the provider's settings, and the record must be published exactly, without extra quotes or spaces.
Free Tools
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