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mail-in-a-box / mailinabox

Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.

Home Page:https://mailinabox.email/

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Add Message-ID

toth-dev opened this issue · comments

commented

If the sending client or server doesn't set the field MIAB won't add one, which I think can cause two problems:

  1. Adds to the spam score of the mail, see #1356 (comment), the current SpamAssassin config gives it a +0.1

  2. It can result in the duplication of the mail if it's sent to multiple addresses of the same user.

Roundcube uses <{hash}@{domain}> as the ID, complying with the suggestion in the RFC.

I'm not familiar with SMTP, so I might have missed some reason why this is not a good idea.