Enhancement Request: option in config file to add a header line to each email header

[ph1248]

Hi, thanks for yout work, msmtp is very useful and lean.

I would like to propose a new option for the config file:

'append_header_line _headerline_'

This would append the line headerline to the email header for each email sent via the profile. This option could be present mutliple times for each profile, to be able to append several header lines.

One use case would be to add a header line indicating the charset for the email. Potentially there may be many more use cases.

Thanks for considering this.
Best regards

[marlam]

Msmtp tries hard to not get into the business of modifying mails, so this feels out of scope.
Headers indicating the character set or other information should be set by the mail user agent, not by msmtp.

Or you could use a wrapper script that modifies the incoming mail before handing it over to msmtp.