First noticed it a few days ago, this sort of thing has happened before a long time ago but never lasted as long.
I'm running a MacBook Pro and an iPhone 6s with a btinternet account I've had forever.
I'm still receiving email on both devices but if I try to send anything it just stays in the outbox with a message about verifying the mailbox/server etc settings.
I can send myself an email and webmail works ok but it's a bit of a faff to use webmail and I find the webmail interface difficult to use from an accessibility point of view.
I'm happy to verify the settings myself if I know what I'm looking for.
Solved! Go to Solution.
Are you a BT Broadband account holder or are you paying for your email account through a BT Premium email account?
I would guess BT Broadband account holder, I've had the package since the late 90's and never bothered to change as I have a good email address.
Just noticed that on the MacBook the error message says it can't be sent because of potential malware spam phishing etc risk
Mail connection doctor says it's connecting to SMTP but not IMAP?
On the Macbook go to mail, preferences, accounts, server settings.
Under smtp you should have the settings as shown here
Well thanks for all the advice which wasn't needed in the end as the problem MIRACULOUSLY resolved itself YET AGAIN...
Did you follow my advice?