I to have a similar problem, as above. Upgraded install of Avast 5.0.507, I use Thunderbird 3.0.4 with a Gmail 5 Imap accounts, Windows XP SP3, with the following current setup:
Account Server Settings:
Server Name, imap.gmail.com Port 993
User Name, me@gmail.com
Security settings, SSL/TLS (unchecked) Use secure authentication
Outgoing Server (SMTP):
Server name, smtp.gmail.com Port 465
(checked) Use Name & Password
User Name, me@gmail.com
(unchecked) Use secure authentication
Connection security SSL/TLS
These have so far been the only setting that work most of the time.
I have used the following encrypton on my imap accounts (none, SSL/TLS, & STARTTLS), as well as disabling each of the same encryption on SMTP Gmail Outgoing server settings. It still results in a popup stating that: The message could not be sent because the connection to SMTP server smtp.gmail.com timed out. Try again or contact your network administrator.
Needless to say, there is no administrator, just little old me.
Imap Gmail was working properly previously using port 993 with SSL, and using SSL for STMP port 465.
After Avast updated to Ver.5, I still use settings to imap to port 993.
Under Outgoing Server, I have tried the following:
Port 25, 465, and 587 each (with & without none, with & without SSL/TLS, with & without STARTTLS). In Avast 5, Real-TimeShields, Settings, (Expert Settings), I have disable inbound, outbound, & newsgroups message settings, no help.
Nothing has allowed me to connect with Imap Gmail or have any Imap mail scanned, in or out.
On occasion, and I can't tell when or why, I am able to send out small file sizes, small than 2 meg.
I need this to work on file sizes up to Gmail's maximum size.
Please help, I have experimented with this problem for about 12 hours over the last 3 days now. What am I not seeing, that I need to correct. Thanks