e-mail forwarding via smtp relay

anctop · 06-27-2021, 11:10 PM

Hi,

Our system is using "Sendmail" as MTA & "procmail" as LDA.
Per user e-mail auto-forwarding is implemented with the "~/.forward" mechanism.

I'd like to ask how to configure forwarding to use an external SMTP relay instead of the default local "sendmail" executable.

Thanks in advance.

TB0ne · 06-29-2021, 08:13 AM

Quote:

Originally Posted by anctop

Hi,
Our system is using "Sendmail" as MTA & "procmail" as LDA. Per user e-mail auto-forwarding is implemented with the "~/.forward" mechanism. I'd like to ask how to configure forwarding to use an external SMTP relay instead of the default local "sendmail" executable.

You enable a relay host in the sendmail config file. One of the first hits in Google for "linux sendmail relay host"
https://www.snel.com/support/smtp-relay-with-sendmail/

anctop · 06-29-2021, 09:33 PM

Quote:

Originally Posted by TB0ne

You enable a relay host in the sendmail config file. One of the first hits in Google for "linux sendmail relay host"
https://www.snel.com/support/smtp-relay-with-sendmail/

Thanks for the suggestion.

I should apologize for not having my question stated accurately.

The approach is good for relaying all e-mails to an external SMTP host, but I am looking for a solution for per user forwarding, i.e. some users forward with local "sendmail" and some via SMTP.

It is heard that e-mail auto-forwarding can also be achieved via "~/.procmailrc". However, I am not familiar with "procmail" configuration.
Would it be possible to solve my problem by devising some tweak in "~/.procmailrc" ?

descendant_command · 06-30-2021, 05:24 AM

Maybe msmtp would suit.

TB0ne · 06-30-2021, 08:04 AM

Quote:

Originally Posted by descendant_command

Maybe msmtp would suit.

+1 for this, given the updated information from the OP.

anctop · 07-01-2021, 01:30 AM

Quote:

Originally Posted by TB0ne

+1 for this, given the updated information from the OP.

Thanks for the suggestion. I'll try it.

ondoho · 07-01-2021, 02:55 AM

Another general +1 for msmtp from me.
Have also posted about it on my personal blog.