GpgOL warns if the security flags are calling for S/MIME with internal Outlook encryption but GpgOL encryption is also requested.
This warning can occur even when outlook encryption is not user visibile toggled.
https://wald.intevation.org/forum/message.php?msg_id=7746&group_id=11
We should ignore any values for the PR_SECURITY_FLAGS that are undocumented and don't show a warning in that case. It might lead to undefined behavior but so far it is mostly looking like false positives.