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I have a fleet of Ubuntu clients running msmtp-mta along with heirloom-mailx. I'd like to have the same /etc/msmtprc on all machines.

At present, when someone uses mailx or sendmail, the mail will be from user@mydomain.com and the only clue to the client machine is the IP address in the mail header.

Is there a way to add the client host name to every mail sent? Like

  • Prepend it to the subject or
  • auto-attach a file to any mail or
  • change mydomain.com to client.mydomain.com (remember, one file to rule them all, and changes in host name should be met automatically)

Note: I cannot configure the actual SMTP-Server, just the msmtp client.

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You could try ssmtp instead of msmtp. I use msmtp myself, but you have to set the maildomain in the msmtprc for that; ssmtp uses the hostname directly I think. If you can settle for "the same msmtprc except for the maildomain", then client.mydomain.com should be possible with msmtp. –  frostschutz Apr 9 '13 at 17:31
    
Nice one, frostschutz! I would upvote you if I could! Note: I installed both (m|s)smtp, let msmtp provide sendmail so users can use mailx as they are used to. root and other reporting system accounts get a .mailrc that uses ssmtp as sendmail and hence provide the one-to-rule-them-all host name config /etc/ssmtp/ssmtp.conf. –  arney Apr 9 '13 at 21:41

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