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This patch implements the first steps of support for IDNA (Internationalized Domain Names for Applications). Internally, we maintain the byte-agnostic representation, including configuration. We support receiving IDNA mail over SMTP, which we convert to unicode for internal handling. Local deliveries are still kept agnostic. For sending over SMTP, we use IDNA for DNS resolution, but there are some corner cases pending in the SMTP courier that are tied with SMTPUTF8 and will be fixed in subsequent patches.
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.