I am having trouble sending and receiving emails on my IMac - it says wrong login details - but I can login on webmail?
It works fine on my IPhone? Any suggestions please
I have moved you onto your own thread as the one you posted on has nothing to do with your problem.
Are you presently a BT Broadband customer or are you paying for your email through a BT Premium email account?
If neither of the above your email account may have been downgraded to a BTMail Basic account which can not be used with an email client. It may still work on your iPhone but that can change at any time.
See link
https://www.bt.com/help/email/bt-email-products