Hi Peter
I use emclient a lot and am even a beta tester
The error is the error message, and your setting will be wrong I believe
Have you tried pop instead of IMAP
I would check your BT account settings for IMAP server, username and password, to make sure there correct
Lastly, depending upon which antivirus program your using, the error could relate to antivirus, as some use the mail settings, so you may need to check your antivirus for email settings
Lastly, it is never a good idea to publicly advertise your email address
Many thanks
John