Your BT ID username is what you are using to log into the BT Email services then, it is typically the email address which you’’ have been provided when you setup your account until you have found an older account, in that case, you might be
QuickTime Plug-in 7.7.2
Shockwave Flash
Shockwave for Director
Silverlight Plug-In
Java Deployment Toolkit 7.0.40.255
Java(TM) Platform SE 7 U4
Adobe Acrobat
VLC Web Plugin
Winamp Application Detector
DivX Web Player
Windows Presentation Foundation
DivX
Otherwise, it could be some software on your computer that's doing it. Have you installed any new software recently? Sometimes unwanted software comes bundled along with software you want to install, but I don't know if that's the case on Mac