How to add custom headers on sendmail

Question

I have a sendmail server and I'm trying to set it up to add a custom header called "Feedback-ID" to all outgoing messages in order to keep track of the messages sent from the server using Google's postmaster tools, however I've found surprisingly little documentation regarding that.

Is there any way to do it? Please note that this header must be added to all outgoing mail, including those received from remote clients that use my server as their MTA, and not only local messages.

score 0 · Accepted Answer · answered Feb 17 '20 at 14:30

0

After a bit of tinkering I found the solution. I added this to the end of sendmail.mc:

LOCAL_CONFIG
HFeedback-ID: header_value

answered Feb 17 '20 at 14:30

Diego Lima

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Where is that file? – DevOpsSauce Jul 14 '22 at 13:55
Usually it's located in /etc/mail – Diego Lima Jul 14 '22 at 23:12

How to add custom headers on sendmail

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