WordPress Emails - Mailed By


I have two WordPress sites on a droplet.

When a user registered an account on, an activation email sent to the user. But the “mailed by:” in the header shows that it’s mailed by

The signed by is correct, which is signed by

I guess that’s the reason why it gets into spam folder? Because it’s mailed by other domain.

How do I set it to have (and any other domains on the droplet) to be mailed by its own domain? e.g., mailed by e.g., mailed by

I have Postfix and OpenDKIM on the droplet.

Thank you.


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