[sup-talk] About faking message IDs

[Michael Stapelberg <michael+sup@stapelberg.de>]

Hi,

I just noticed that the lack of emails from my backup program seems to be
because of the missing message ids in the mail script I use. In case of
no message id inside the header, sup uses the md5sum of the whole header
(see lib/sup/message.rb:74). This effectively means that messages having
the same md5sum of their header (which happened, since the header was also
generated completely by the script and the values did not change) will
"overwrite" the old message.

As a workaround, I now added the current time to my script, so that every
header will have a different md5 sum. But maybe we can think of a more
clever way to generate faked message ids? Maybe also hash the body of the
message?

Best regards,
Michael
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