DKIM & SPF records for subdomain

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DKIM & SPF records for subdomain

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I thought I had DKIM and SPF sussed but Google disagrees.

I'm sending mail from server.mydomain.tld but I've created records for my domain.tld so that explains the bounces...

Creating a SPF record for server.mydomain.tld is easy enough, I can duplicate the existing mydomain.tld record. (?)

But for the DKIM? What address is the DKIM public key Synology Mail Server creates? In Mail Server (this is not MailPlus Server!) under Security -> Authentication I created a public key but is that for selector._server.mydomain.tld or selector._mydomain.tld?

The server hostname as set in SMTP is server.mydomain.tld. I have a couple of Additional Domains listed, but I thought they were in order to accept incoming mail to other domains?

Thanks for pointers!
 

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