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1 vote

Postfix OpenDKIM unable to sign outbound email

You have to create your own keys to be able to sign outgoing email, opendkim comes with a key generator (opendkim-genkey). I have no knowledge of google's admin portal, but if you control the DNS of ...
0 votes

How destination mail server can know the DKIM selector

The selector is on the DKIM-Signature header that is added to the email by the signer, along with the signing domain identifier (SDID). The selector is on the s= tag and, together with the domain in ...
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2 votes

How destination mail server can know the DKIM selector

The DKIM-Signature header field in the e-mail message itself contains the selector used (as well as the d= domain) as a mandatory part of the signature / header: RFC 6376 s= The selector ...
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3 votes

How destination mail server can know the DKIM selector

It's contained in the DKIM header. Example: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=example.com; s=default; This corresponds to the txt record under the following DNS record: ...

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