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Hi friends,
I have a doubt.
Having two postfix servers, one of which MX backups,
and wanting to activate Open DKIM for stop forged senders in my domain, my question is:
Should I activate Open DKIM on both server (primary and backup) or only on primary?
In my experience, you will want to turn DKIM on for your entire domain, and any domain that may send mail on your behalf. Otherwise, your newsletters, or other things that other departments sends out through another agency, will start to get blocked.
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Open DKIM and MX backup server
