firstly by using crypto/rand in those cases. and secondly by putting a lock
around the Read (though it isn't used at the moment).
found while working while implementing sending tls reports.
before this change, a message in the rejects folder that was read and marked as
notjunk (e.g. automatically by webmail), could cause a dmarc report to be sent
for another junky message from the domain. we now require positive signals to
be for messages not in the rejects mailbox.
the text/plain body of a dmarc report contains the period, but it was in local
time while claiming to be in utc. make it utc, so we often get nicely rounded
whole 24h utc days.
in smtpserver, we store dmarc evaluations (under the right conditions).
in dmarcdb, we periodically (hourly) send dmarc reports if there are
evaluations. for failed deliveries, we deliver the dsn quietly to a submailbox
of the postmaster mailbox.
this is on by default, but can be disabled in mox.conf.
