After receiving an automatic avast update this morning I can no longer send messages from Outlook 2007. Ok after disabling mail shield.
Everything was ok before this update.
The last popup message saying that current versions are 131105-1 so I suppose that’s the problem.
avast! free 2014.9.0.2007 131105-1
Windows 7 Pro 64-bit
do you get any error messages…what does it say?
I am also having problems after update, I can receive mail, but unable to sync via IMAP. If I disable email scanner, all works fine. 
I receive the following message from the “System Administrator”:
Your message did not reach some or all of the intended recipients.
topic:
Posted :06-11-2013 12:23
There could not be delivered to the following recipient (s):
XXXXXXXX@XX 06-11-2013 12:23
550 5.6.0 Lone CR or LF in body (see RFC2822 section 2.3)
if you do a avast repair…does that change anything?
controlpanel > ad/remove programs > avast > uninstall/changee > repair option … wait a minute and reboot
Repair does not solve the error.
When mail shield is on, I can only receive emails.
Try the suggestions in this thread - but read the whole thing to the bottom past my last entry:
http://forum.avast.com/index.php?topic=117826.0
Good luck.