I have created a subdomain with a different Ip of A different server and I created an email from that subdomain, the problem is that the Outgoing Ip of the Email is the Ip of The Main Domain not the Ip of the subdomain
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Would you please share more details about the mail configuration?
We have an article on How To Install and Configure Postfix as a Send-Only SMTP Server on Ubuntu 22.04
I’ll also recommend you to check this article Why You May Not Want To Run Your Own Mail Server