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Please add information about '''your''' experience with antivirus software (create a wiki account, and select edit).<br><br>'''Disclaimer: Problems may occur that are not listed here. The information here is anecdotal based on , that is users like you giving their personal experiences, . We do not based on have an organized battery of testing. You can So if you have a problem with antivirus software that is not listed here, please help other users by please adding your own experienceto the list. (create a wiki account, and select edit). '''
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'''This article is not just about performance issues.''' Antivirus software can also [[Thunderbird:Testing:Antivirus_Related_Performance_Issues#symptoms|cause bad or incorrect behavior, and crashes - consistently or randomly]].
= Symptoms =
Possible symptoms, which can be consistent or random:* Mild to severe poor performance problems
* Not able to get new mail
* OS hangs and or crashes
Including but not limited to doing the following:
* Replying to a message / Sending a message
* Displaying a message
* Images not displaying. <small>[http://getsatisfaction.com/mozilla_messaging/topics/what_happened_to_progress_with_new_versions_going_backward#reply_3328214 Sometimes anti-virus programs block AV blocks images in HTML emails] and sometimes [http://getsatisfaction.com/mozilla_messaging/topics/what_happened_to_progress_with_new_versions_going_backward#reply_3328214 malware installs bogus System Proxies which block or slow down all internet connections including like sending and receiving email, images in email and web browsing]</small>* Starting Thunderbird startup
{{Warning|Your AV software has probably has worked great for ages in previous versions of Thunderbird. That is NO guarantee that it will work well in a new or any future version of AV or Thunderbird. When either one AV or Thunderbird changes version versions there can be interaction problems - even if for you Thunderbird is the only software affected, and even if your AV version did not change. ''You must explicitly test by disable/enable of AV to determine the impact on Thunderbird.'' The quickest way to test, is to [http://bit.ly/1MU6eMa start Windows in safe mode].'''}}
= First Steps =
The quickest way to test in impact of other software on Thunderbird is to [http://bit.ly/1MU6eMa start Windows in safe mode].'''
{{Warning|Your AV software has probably has worked great for ages in previous versions of Thunderbird. That is NO guarantee that it will work well in a new or any future version of AV or Thunderbird. When either one changes version there can be interaction problems - even if for you Thunderbird is the only software affected, and even if your AV version did not change. ''You must explicitly test by disable/enable of AV to determine the impact on Thunderbird.'' The quickest way to test, is to [http://bit.ly/1MU6eMa start Windows in safe mode].'''}}
= Problem Antivirus and Anti-Malware Packages =
To test if the whether Antivirus and or Anti-Malware software is causing a problem, you must disable it the software temporarily or run [http://bit.ly/1MU6eMa run Windows in safe mode]. For permanent solution of the problem Permanent solutions might require you may need to disable parts of the software, change to different software, or exclude Thunderbird profile folder locations from scanning, which typically will be . The default profile location on Windows is [https://support.mozilla.org/en-US/kb/profiles-tb '''%appdata%\thunderbird\profiles''' ] **NOTE, if you altered default profile location or Thunderbird accounts to put mail somewhere on disk other than the standard profile location, you will need to also exclude those nonstandard locations.
Problems have been reported with:
=== Avast caused slowness and errors regarding nsemail.HTML ===
The release of Avast 10.3.2223 ( We think it is that version) has resulted in issues with avasts preventing Thunderbird from functioning correctly. The workaround appears to be to create an exception in avast for the file nsemail.html in your computers temp folder. I have to say "appears to be" as Avast have not yet replied to my email. [https://forum.avast.com/index.php?topic=174203.msg1237332#msg1237332], [https://forum.avast.com/index.php?topic=174392.msg1238419#msg1238419], [https://forum.avast.com/index.php?topic=78428.msg1236530#msg1236530], [https://forum.avast.com/index.php?topic=174153.msg1237802#msg1237802], [https://forum.avast.com/index.php?topic=174153.msg1237802#msg1237802], [https://forum.avast.com/index.php?topic=174140.msg1237521#msg1237521] SUMO links [https://support.mozilla.org/en-US/questions/1068609], [https://support.mozilla.org/en-US/questions/1075713]
=== Avast caused application hang when causes hangs with "Allow anti-virus clients to quarantine individual incoming messages" is selected ===
As advised by user BigDave67 in th support topic [https://support.mozilla.org/en-US/questions/1094117 1094117]
# Restarted Thunderbird.
=== Avast 2015 Causes Warnings about causes invalid mail server certificates when certificate warnings sending and /receiving e-mails mail ===
Avast describe the cause thus "The Mail Shield in Avast 2015 uses advanced scanning method for incoming and outgoing e-mails over SSL/TLS secured connections", the reality is they perform a man in the middle hack of your connection using SSL certificates by making themselves a top level certifying authority. As Thunderbird like all quality mail client maintains it's own certificate store the Avast hack does not work. There are [https://www.avast.com/en-eu/faq.php?article=AVKB91#artTitle instructions on the avast site] explaining how to make then a trusted certifying authority.
[http://en.wikipedia.org/wiki/Malware Malware] (usually found only on Windows systems but could be on any system e.g. Mac or Linux; it's just much rarer for Mac and Windows systems) can install a bogus Internet access proxy.This proxy can slow down Thunderbird and other programs that access the Internet with the symptoms being "couldn't connect to proxy" errors, slow sending and receiving of email and images not being displayed in HTML emails.
== Problem:[http://getsatisfaction.com/mozilla_messaging/topics/what_happened_to_progress_with_new_versions_going_backward#reply_3702668 Windows System Proxy blocking HTML images anecdote from GS] ==
* don't think this is a MalwareBytes problem but you never know!
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