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Comment on Recommendation for outgoing-only SMTP server

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

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vegetaaaaaaa@lemmy.world ⁨7⁩ ⁨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
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- markstos@lemmy.world ⁨7⁩ ⁨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.
  
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  - vegetaaaaaaa@lemmy.world ⁨7⁩ ⁨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
    
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