Hi @Wencer
I have been doing more work on this and I am not convinced this is actually a TalkTalk issue. It looks like something has caused the SMTP mail server (outgoing emails) password to be erased in the email client. Alternatively, your email address can be reported as being incorrect.
Thunderbird is simple; putting the password back seems to have resolved the issue.
New Outlook for Windows can be a bit more complex. For more details, please see my post #20 in this thread of mine:-
https://community.talktalk.co.uk/t5/Email/TalkTalk-net-domain-SMTP-mail-server-not-responsive/m-p/31...
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KeithFrench is one of our valued Community Stars and can help with a range of issues related to wireless and networking. At times, he may ask you to send him test results via a Private Message to help analyse/diagnose an issue. Although Keith does not work for TalkTalk, he very kindly shares his time and knowledge to help others.
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