New iMac won't add mail account

Thanks for the response but as stated in my question, I know how to add or remove an email account when the device is functioning as expected. For some reason my new iMac won’t accept the email address and password of the additional account, despite it running on my other Apple devices.

Any other suggestions appreciated

Thanks.

OK, thanks.

I've opened Mail > Add account > Choose provider

Enter Account name, email address and password - all of which which I've entered correctly, having rechecked from my saved password list and from the account provider on line: which is BT (British Telecom).

At this point the process stalls for several minutes and fails to connect.

I've checked there's not a problem with the BT mail account by sending a mail from my Apple address: it arrived immediately.

Not being very good with tech, I've run out of ideas.

Thanks again for trying to help.

Hi.

I followed your advice to restart in Safe Mode but after restart it was just the same. I tried loading a different mail account which was also rejected. I called the Apple Care number but it was closed, out of hours, when suddenly a pop-up on my desktop announced that my BT mail account had loaded, despite the fact that I'd given up trying.

Seems to be working fine now. Go figure.

Thanks for the advice.

Mike

When I say my test mail arrived immediately in my BT mail account, I meant on my iPhone, not the iMac with which I'm having the problem