I’m testing the upgrade from 7.10.10 to 7.10.15. Yeah I should stay more up to date but I am at least using a test bed server as is recommended. 
Looking good so far but I noticed that if you don’t have inbound email settings configured you won’t be able to send email. The logic seems to trip on the reply to field that is set in the inbound email settings and you get incorrectly formatted from and reply-to fields.
This stumped me for a couple of hours today, since I started with 7.10.10 I didn’t have inbound email configured (that was a bug in 7.10.10)…
Thanks for the awesome fixes! Outbound email with attachments and documents works great now!
Hope this helps!
Randy Bowie | Trinity Guard