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If there's an alias to forward email to a non-local domain, using the original From is problematic, as we may not be an authorized sender for it. Some MTAs (like Exim) will do it anyway, others (like gmail) will construct a special address based on the original address. This patch implements the latter approach, which is safer and allows the receiver to properly enforce SPF. We construct a (hopefully) reasonable From based on the local user, and embedding the original From (but transformed for IDNA, as the receiver may not support SMTPUTF8).
This directory holds end to end tests, written usually in a combination of shell and some Python. They're not expected to be portable, as that gets impractical very quickly. They also have some dependencies, listed below. === Dependencies The tests depend on the following things being installed on the system (listed as Debian package, for consistency): - netcat (nc) - msmtp - util-linux (for /usr/bin/setsid) For t-exim (Exim interaction tests): - gettext-base (for /usr/bin/envsubst) - The exim binary available somewhere, but it doesn't have to be installed. There's a script "get-exim4-debian.sh" to get it from the archives.