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Tip: Prevent Exim from adding a Sender header to outgoing mails

Posted By: apeiro

Exim likes to add a "Sender" header to outgoing emails. If this differs from the "From" header you set, some email clients will note this.

If the purported From address is bob@example.com but the Sender header (attached by Exim) is apache@example.com then some email clients will display the message as:

From: bob@example.com (on behalf of apache@example.com)

Yuck. To fix it, add the following to your exim.conf:

no_local_from_check
untrusted_set_sender = *

Tested on exim 4.66.