Mailparse is an utility to parse postfix log files and display the path of a given message in an easy-to-use manner.
Search for a message ID in a given log file:
$ mailparse [message-id] /var/log/prod/mail/mail.log
Search for a message-ID across multiple log files:
$ mailparse [message-id] /var/log/prod/mail/mail-*.log
Search for a message-ID across a few days (also works with gzipped log files):
$ mailparse [message-id] /var/log/prod/mail/mail-2021-03-{24,25}*
Search for a message-ID across all uncompressed mail-related log files (warning: this is usually slow):
$ mailparse [message-id]
mailparse can simply be build with cargo build --release and then
used from target/release/mailparse.
Unfortunately, current debian's rustc is too old for that, and it means that we have to build it another way.
The recommended way is to build a musl-static version of mailparse on a machine
that has nix installed, by running ./build-static.sh from the root of the
repository. This generates a result/bin/mailparse file, that can then be
copied to the relevant server and used from there. Be aware that the first time
you run it build-static.sh will build a musl-ready rustc, so this will take
some time and require some memory.
Hopefully this will no longer be required after a few upgrade cycles. For now, a compiled version of the program is available at /home/x2014gaspard/mailparse