Hi All, … New to the forum. Yesterday I reinstalled Avast version 4.7. Since that time I have been unable to use my Thunderbird e-mail. When I turn off Avast I can send and receive e-mails. How do I remove the e-mail scanning? Thank you.
Instead of disabling email scanning, take a look at the following post and see if that helps you set scanning up properly
in Thunderbird utilizing Stunnel:
http://forum.avast.com/index.php?topic=28150.msg229747#msg229747
Welcome to the forum. 
If you aren’t using SSL/TLS (encrypted) email as Bob suggests, especially if you were previously able to send and receive with avast installed, then check below.
Sounds like firewall blocking if when you disable avast email scanning it works.
What is your firewall ?
Does it allow ashMaiSv.exe internet access ?
- If it does delete the entry for it and check for email, this will force the firewall to ask permission again.
bob3160 and DavidR,
All is well. Apparently I started using my e-mail too soon. Later attempts allowed me to transmit and receive mail. Thank you both for your interest and support.
Your welcome. Glad your problem is solved.
Again, welcome to the forum.
No problem, glad we could help.
Welcome to the forums.