I too will be interested if you receive any feedback/solution from Avast Team…I have many PCs still on V8…tried to upgrade to V9 many weeks back on two of them and this was first issue I ran into. I use Outlook 2010 via Office 365 Exchange Server. Did some searching on the Forum and there are tons of “email issues” and some center around this. Here is one example: http://forum.avast.com/index.php?topic=140959.0

Because there is no Avast Team identifying this is a problem, and any fix coming, I reverted back to V8…I can’t have email issues…too critical to my needs. There are many other “warts” with V9/2014 but not even going down that road until this is verified fix/working.

Here is another post/thread on a solution but it is a “patch” and no one knows (or has commented) on what it opens you up to.
http://forum.avast.com/index.php?topic=141404.0
You may want to try to see if it has any effect on your issue…BTW, changing port settings is not recommend.
If it works I would sure check the email scanner/shield and check to see if your incoming emails are truly getting scanned.
I think there was a post awhile back that the new GUI doesn’t show this or is hard to find the last email scanned/etc info.
To me the solution below means you are avoiding the scan…hard to tell though since no one has commented. :frowning:
I personally would not mind a temp issue of outbound emails not being scanned, but changing port 80 or the below worries me about inbound.
From the avast GUI click “Settings” → “Active Protection” → “Web Shield” (click the gear symbol on the right) → then while in the Main Settings window put a check mark in the “Scan traffic from well known browser processes only”.