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email logon failed

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I have a BT mail account. I also have my own domain and 3 email addresses associated with that domain which I access through T'bird.

On settings, for all three addresses my incoming server is pop.mydomain.co.uk and the out going server is myname@btinternet.com - mail.btinternet.com

This has worked successfully for the last 3 years.

Now one of the addresses will not work - I get the message: "Sending of password for user1at@mydomain.co.uk did not succeed. Mail server pop.mydomain.co.uk responded: user1@mydomain.co.uk logon failed"

Can anyone help, please ?

I have a BT mail account. I also have my own domain and 3 email addresses associated with that domain which I access through T'bird. On settings, for all three addresses my incoming server is pop.mydomain.co.uk and the out going server is myname@btinternet.com - mail.btinternet.com This has worked successfully for the last 3 years. Now one of the addresses will not work - I get the message: "Sending of password for user1at@mydomain.co.uk did not succeed. Mail server pop.mydomain.co.uk responded: user1@mydomain.co.uk logon failed" Can anyone help, please ?

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You'll need to check with your hosting/email provider.