I am getting MCMailErrorDomain error 1045 with my BTinternet account
I an getting /MCMailErrorDomain error 1045/ error with my BTinternet mail account. Incoming mail is OK but I cannot send mail.
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From the Mail menu bar, please select
Window ▹ Connection Doctor
Click the Show Detail button. A drawer opens. Try to send a test message and post the text that appears.
Anonymize any private information before posting. That means names, email addresses, contents of messages, and anything else that you don't want to make public.