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Kind of clone of an upstream bug report:
https://bugzilla.gnome.org/show_bug.cgi?id=749292

The SMTP connection can timeout and fail to send the message. The upstream bug report claims that the message pretends to be sent, while it isn't, but I wasn't able to reproduce that. I was able to reproduce the timeout on the connection when cheating in the code.

I suggest to use the upstream patch proactively, even not being to reproduce the issue without code cheating.

(In reply to Milan Crha from comment #0)
> The SMTP connection can timeout and fail to send the message.

Just realized, when the upstream reporter updated the bug report, that the reason was also elsewhere, already fixed in 3.16.0, but not in 3.12.x. The other part of the fix is commit [1], with which I'm updating the patch for this bug report.

[1] https://git.gnome.org/browse/evolution-data-server/commit/?id=bae0c64

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2226.html