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→McAfee: Comments need updating
*# Add the "Thunderbird" and [https://support.mozillamessaging.com/en-US/kb/profiles#w_how-to-find-your-profile "Thunderbird Profile"] folders and subfolders. Folder names '''must''' finish with a backslash. '''NOTE, if you have customized profile or account locations for mail, then you must exclude your custom locations.'''
* Please write/call McAfee support to inform them of your difficulty. They can't fix what they do not know about.
[The above comments relate to an older version of McAfee; version 17.6 is quite different; e.g. to stop scanning email attachments you must click Real-time scanning/Schedule and run scans/Settings/Scan these attachments.../(uncheck) Email attachments]
If none of the above helps and you suspect McAfee is the cause then you may need to remove McAfee using the [http://service.mcafee.com/FAQDocument.aspx?id=TS101331 McAfee Consumer Products Removal tool], and seek different antivirus software.
