Try setting TB to allow individual email message scanning.
The Following From Mozilla Knowledge Database
Keeping your antivirus software from deleting your Inbox
Thunderbird stores all of the messages that you see in your Inbox
folder in a single file called "Inbox." in your profile folder. All of
the other mail folders also use a single, correspondingly named file
("Sent.", "Drafts.", "Trash.", etc.). Some antivirus software assumes
each message is stored as a seperate file so when it detects a virus
in your Inbox it deletes the whole file (your entire Inbox folder)
rather than deleting that message. This problem is due to a design
flaw in certain AV programs, not in Thunderbird, and it is known to
occur with Outlook Express , Eudora and other email clients.
Fortunately, there are measures you can take to keep it from
happening.
Antivirus program settings
* RECOMMENDED: Use an antivirus program that's compatible with
Thunderbird (listed below).
* IMPORTANT: Set your antivirus software to ask what to do or to
at least only quarantine infected files rather than to automatically
delete or "repair" them.
* If your antivirus software includes a proxy for incoming e-mail,
which scans for viruses before they reach Thunderbird, use it and keep
it updated.
Advanced users might also wish to configure their AV software as
follows. (For explanation of the rationale behind these measures, see
Email scanning - pros and cons.)
* Especially if you must use an incompatible antivirus program,
configure it to not scan Thunderbird's "Inbox" file (located in your
profile folder) for viruses. You may also want to exclude other
mailbox files (such as "Sent", "Templates", etc.) from being scanned.
* Even if your AV program is compatible with Thunderbird, consider
turning off your AV program's e-mail scanning but not its autoprotect
function.
* Even if your AV program is compatible with Thunderbird, consider
also configuring it to not scan the Inbox and other mailbox files
during system scans and to not let autoprotect monitor these files.
Thunderbird settings and use
To minimize the chance of your Inbox being quarantined or deleted:
* Compact folders regularly. Otherwise your antivirus software
might detect infected messages that you've deleted. Deleted messages
are just marked deleted and hidden from view but aren't physically
deleted until the folder is compacted.
* Try setting Thunderbird (version 1.5 or later) to download each
individual message to a separate file before adding it to your Inbox.
This should make it easier for some antivirus software to quarantine
individual messages instead of taking action on the whole Inbox file.
To have Thunderbird download your POP3 e-mail in this way, go to
"Tools -> Options -> Privacy -> Antivirus" and check the box for
"Allow anti-virus clients to quarantine individual incoming
messages".
To minimize the loss of mail if your Inbox ever does become
quarantined or deleted:
* Keep your Inbox relatively empty by storing most old messages in
other folders. That way, if your antivirus software deletes/damages
your Inbox, fewer e-mails will be affected.
* If you use a POP account configure Thunderbird to leave mail on
the server for a short period (e.g., 3 days), rather than deleting
them immediately when downloaded. That way, if your antivirus software
damages your Inbox you can download those messages again. To leave
messages on the server for a specified number of days:
o in Thunderbird: go to "Tools -> Account Settings ->
[account name] Server Settings", check the box for "Leave messages on
server" and set the number of days.
o in Mozilla Suite: go to "Edit [in Mozilla Mail] ->
Preferences -> Mail & Newsgroups Settings -> [account name] Server
Settings", check the box for "Leave messages on server" and set the
number of days.
* Make regular backups of your Thunderbird mail and other profile
data.
Other measures
* Consider using third-party software such as Mailwasher that will
remove infected messages from the server before Thunderbird downloads
them.
* Use an e-mail provider (usually, your ISP [Internet Serivce
Provider] or hosting company) that scans incoming e-mail for viruses.
Compatible antivirus programs
Avast, AVG, NOD32, and Kaspersky seem to be safe choices, and the
retail version of Symantec a risky choice based on comments from the
forums over several years. There doesn't seem to be a consensus for
CA, F-Prot, McAfee, Panda etc. though typically enterprise versions of
any anti-virus program seem to be more compatible than retail
versions. We used to try identify what versions of anti-virus programs
worked and didn't work but that information was typically several
years out of date so its been deleted.
The free version of Avast seems to meet most users needs.
Hopes this help...
Eugene
On Oct 20, 12:54 am, alanrf <[email protected]> wrote:
> I just would like to note in response that it is not happening with my
> antivirus (avast) for my multiple Yahoo accounts and it is not
> happening for any of the folks I support with their Yahoo accounts and
> the Webmail add-ons (and - no surprise - they all use avast too). It
> is happening with your account on whatever system you use - and the
> systems you use have the same antivirus. I will leave the deductions
> to you.
>
> Please try the option to exclude your mailfile from the antivirus scan
> on your systems and see if that helps you come closer to a decision in
> problem isolation.
>
> On Oct 19, 3:50 pm, DaveI <[email protected]> wrote:
>
> > Hmm...On my Thunderbird I have one POP account and
> > the other is the Yahoo Web Mail...The POP account is fine and never
> > has a problem..
> > Only the Yahoo Web Mailinboxof Thunderbird...So you're saying that
> > both
> > my computer and my friend's computer both are having theinbox
> > deleted
> > because there's an email in the Yahoo WebmailInboxthat our Antivirus
> > does
> > not like...Not sure how to cure that without deleting all the email in
> > theinbox...
> > And funny how it doesn't seem to have any problems with the POP email
> >inbox...
> > Entirely possible of course that it is tied to the Antivirus..Just
> > funny that it's only
> > happening on both mine and my friend's computer for only the Yahoo
> > Webmailinbox...
>
> > On Oct 19, 5:21 pm, alanrf <[email protected]> wrote:
>
> > > These extensions never touch theInboxor any other files of
> > > Thunderbird. The extensions simply and only act as a pipe for the
> > > transfer of messages from Yahoo to Thunderbird. All management of the
> > > folders and files in Thunderbird is performed entirely by
> > > Thunderbird.
>
> > > Antivirus programs are the primary cause of lostInboxfiles in
> > > Thunderbird since Thunderbird holds the email in plain text (not
> > > encrypted as some other mail clients do) which makes them particularly
> > > prone to removal. How frequently are you running a full scan - does
> > > the frequency coincide with the number of times the file was deleted?
> > > If you are restoring a file that the antivirus does not like it will
> > > keep on removing it until you find the data it does not like or you
> > > can try excluding theInboxfile from scanning by uoir antivirus and
> > > see if that halts the problem.
>
> > > On Oct 18, 1:17 am, DaveI <[email protected]> wrote:
>
> > > > As the subject line says my Yahoo WebmailINBOXhas utterly and
> > > > entirelyDISAPPEARED3 TIMES in the past
> > > > couple of weeks...I mean theINBOXfolder in Profile/Mail is GONE!
> > > > It's happened 3 times in the past couple
> > > > of weeks and once on my friend's computer. I had to do a restore from
> > > > a backup to restore theinboxeach time
> > > > and lost some mail as I only do full back up about every other week. I
> > > > searched and it appears others have also
> > > > had this happen to them. It was suggested that it might have to do
> > > > with the antivirus...I run Kaspersky Internet
> > > > Security 2010 on my computers and my friend has Kaspersky Antivirus
> > > > 2010 on her computer...So we both
> > > > are using Kaspersky...However when I check to see if something was
> > > > quarantined in the Antivirus there's nothing...
>
> > > > Since this has now happened 3 times in the past several weeks and on
> > > > two different computers it's becoming
> > > > extremely annoying and I have lost email (Unless I want to resort to
> > > > copying theinboxon my computer everyday...
>
> > > > So...What's going on...Anybody have any ideas? Like I said searching
> > > > on "InboxDisappears" for Webmail yields
> > > > similar posts...
>
> > > > I and my friend are both using the latest 1.46 Yahoo extension 1.33
> > > > Webmail extension and Thunderbird 2.0.0.23
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