Comment on Recommendation for outgoing-only SMTP server

vegetaaaaaaa@lemmy.world ⁨5⁩ ⁨months⁩ ago

• markstos@lemmy.world ⁨5⁩ ⁨months⁩ ago

  The one problem with msmtp is that it doesn’t rewrite headers, like “From: root / To: root”. These are not required for SMTP, but they are required by some mail providers who will reject email that doesn’t have an “@” sign in these headers. The author or msmtp has said he does not plan to add this feature.

  I worked around the issue with my own sendmail wrapper that rewrites local addresses in From and To headers before passing the message to msmtp. Someone else posted such a script in this bug report:

  github.com/marlam/msmtp/issues/98

  source

  • vegetaaaaaaa@lemmy.world ⁨5⁩ ⁨months⁩ ago

    You can definitely replace senders with correct mail addresses for relaying through SMTP server that expect them (this is what I do):

    # /etc/msmtprc
    account default
    ...
    # Replace local recipients with addresses in the aliases file
    aliases /etc/aliases
    

    # /etc/aliases
    mailer-daemon: postmaster
    postmaster: root
    nobody: root
    hostmaster: root
    usenet: root
    news: root
    webmaster: root
    www: root
    ftp: root
    abuse: root
    noc: root
    security: root
    root: default
    www-data: root
    default: myaddress@gmail.com
    

    source

    • markstos@lemmy.world ⁨5⁩ ⁨months⁩ ago

      In the issue I linked, the msmtp author makes a distinction with changing the envelope recipient, which msmtp can do, with rewriting the email headers like “To”, which msmtp does not do.

      source

      • vegetaaaaaaa@lemmy.world ⁨5⁩ ⁨months⁩ ago

        github.com/chriswayg/ansible-msmtp-mailer/…/14 While msmtp has features to alter the envelope sender and recipient, it doesn’t alter the “To:” or “From:” message itself. When the Envelope doesn’t match these details, it can be considered spam

        Oh I didn’t know that, good to know!

        The proposed one-line wrapper looks like a nice solution

        source
• markstos@urbanists.social ⁨5⁩ ⁨months⁩ ago

  @vegetaaaaaaa

  After testing ssmtp, nullmailer, and msmtp for relay-only outgoing mail on Fedora #Linux. Here's my final report:

  - ssmtp is packaged for Fedora and I got it working, but the Ansible role I found for it had been abandoned by the author because ssmtp itself is unmaintained.
  - nullmailer might have worked, but is not packaged for Fedora.
  - msmtp worked. I used this Ansible role, after patching it to work on Fedora: https://github.com/chriswayg/ansible-msmtp-mailer

  source