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This patch implements some measures against email loops, such as keeping a limit on the lenght of an address, and rejecting email that has too many Received headers. It's not perfect (a server could be actively removing Received headers), but it should cover the normal accidents and misconfigurations.
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.