Alberto Bertogli 08273ea901 queue: Sync the files written on Put ...

When we put something in the queue and respond "250 ok" to the client,
that is taken as accepting the email.

As part of putting something in the queue, we write it to disk, but
today we don't do an fsync on that file.

That leaves a gap where a badly timed crash on some systems could lead
to the file being empty, causing us to lose an email that we accepted.

To elliminate (or drastically reduce on some filesystems) the chances of
that situation, we call fsync on the file that gets written when we put
something in the queue.

Thanks to nolanl@github for reporting this in
https://github.com/albertito/chasquid/issues/78.

2025-10-18 12:10:24 +01:00

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