Thunderbird: unable to write the email to the mailbox

I have been using Avast on other home PC’s for a while, but just recently switched to it on my personal PC. I’m using Thunderbird for my e-mail which has been working great until I installed avast. (I’ve been using NAV until now).

If there are more than one e-mail messages being downloaded, I get the first one, but I get a Thunderbird pop-up error that reads “Unable to write the email to the mailbox. Make sure the filesystem allows you write privileges, and you have enough disk space to copy the mailbox.”

If I leave this pop-up alone, about a minute later an Avast pop-up displays that reads “Internet connection timeout elapsed. Continue Waiting? (thunderbird.exe → pop.perfora.net:110)”

First off, I have no idea where the pop.perfora.net comes from, its not my email server. But more to the point is that everything works fine if I disable the email scanning by Avast. This is obviously not a good solution. Nav worked fine with the e-mail scanning with thunderbird, but I’m tired of calling to reset my install count every time I format my PC. Naturally, that is the “lesser of the evils” if I can’t get Avast to work properly.

Has anyone experienced this problem or know why this is occurring? Thanks.

See: http://forum.avast.com/index.php?topic=12169.0

Maybe you can add the following line to the [MailScanner] section of \data\avast4.ini:
Log=20
Then generate some traffic, simulate the problem (i.e. force the avast mail scanner to time out by sending an email with attachment) and then post here the contents of the file \data\log\aswMaiSv.log
Details: http://forum.avast.com/index.php?topic=12234.msg103474#msg103474

Increase both avast and TB timeouts.

Using the utility to remove NAV completely seemed to have fixed the problem.

Thanks for such a quick response on a Saturday.

That’s avast! forum 8)
Welcome and try to come back and help the others…