Sending of the message failed.

[Simplefella007]

I have 6 addresses on Talktalk. 5 send with no problem. 1 - which receives ok - will not send. Address is correct and settings the same as one other on tisali and one other on worldonline

Sending of the message failed.
An error occurred while sending mail. The mail server responded: A9GrsHXncj8zL Authentication Required (TT401). Please verify that your email address is correct in your account settings and try again.

[Ady-TalkTalk]

Thanks for letting us know its sorted. 

Ady

[Simplefella007]

removed restarted restored remarkable thanks

[Ady-TalkTalk]

Thanks, everything looks good. Have you tried removing that mail account from your client and readding it. 

Ady

[Simplefella007]

Thank you.  Yes, I can send from webmail. Address is ******@tiscali.co.uk

Ady

[Ady-TalkTalk]

Hi Simplefella007, please send me the affected email address in a personal message. Have you tested with this in webmail?

Ady