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Our non-delivery status notifications are quite simple today, but that makes it much more difficult to support internationalization and cross-language reporting. There is a standard for internationalized DSNs, RFC 6533 (which builds on top of the structured DSNs from RFC 3464). This patch changes our DSN messages to be based on those standards, so it is easier for MUAs to display reports according to the users' languages preferences. Note we still use message/rfc822 + 8bit to transmit the message, instead of message/global, for compatibility reasons. This seems to be more universally compatible, but the decision might be revisited in the future. See RFC 5335 (section 4.6 in particular).
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): - msmtp - util-linux (for /usr/bin/setsid) For t-02-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. For some tests, python >= 3.5 is required; they will be skipped if it's not available.