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This may be a super newbie question, I have an email server running Postfix/Dovecat with SMTP for send and IMAP for receiving.

I have two [email protected] and [email protected]. I want to send emails to [email protected] from [email protected], basically sending and receiving within the same server. I am curious what exactly goes on when I send an email to the same server.

Question: Does it go through ISP or does everything happen all locally without ISP knowing? I want to be able to send without passing through ISP.

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Emails to local mailboxes SHOULD NOT go via your ISP with proper configuration
BUT number of sub-optimal and botched configurations is incredible e.g. some admins want internal mails to undergo anty-virus scans provided by their ISP disregarding privacy concerns.

Send email to yourself from the host and inspect Received: headers in the received message to check delivery path.

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