Outgoing emails stopped working

[Flatman93]

No outgoing emails working from email address.
Using webmail - https://apps.talktalk.co.uk

Tried on alternative devices (ipad/iphone/outlook) and different browsers (edge/chrome/firefox) to no avail, which prompts me to think its a mail relay issue of some form.

Error: An error occurred inside the server which prevented it from fulfilling the request.

Also tried to configure in outlook using smtp config... but returned saying the outgoing email server could not locate my account - hence I believe it's not an issue on the local devices (multiple) using logic.
Outgoing: smtp.talktalk.net Port: 587 Encryption: STARTTLS

As using webmail, cannot see any settings to update or change any smtp/port config for example, as surely this would be managed by the app if there was any change.

Note: incoming emails and webmail access working fine.

This has been like this for a few days now.

Tried the talktalk expert chat and after 2+ hours became an absolute joke and not helpful, as all information provided was ignored. Terrible. Hence raising here with the mear hope that I can get some answers.

Webmail error

[Ady-TalkTalk]

Sadly its not yet showing on the service status board. 

Ady

[Flatman93]

Thanks Ady appreciated. 
Do you have a link to a master reference/thread if this is a wider incident that I can track/monitor progress on? Thanks.

[Ady-TalkTalk]

Hi 041911, I've added you to the list in the incident. Hopefully, we get a fix very soon.

Ady