Unable to send emails on NTL accounts

I have ntlworld email addresses, but I changed my actual account address to a personal (none VM) email years ago.

[Ken W]

Will do

[Edward Leach]

Originally Posted by Edward Leach

Hi,
About a week ago all of our NTL email accounts stopped sending emails.
We can receive emails but are unable to send any.
We use Mac computers and the connection Doctor within Mac mail shows that we cannot access the SMTP servers.
Incoming email is not a problem, but outgoing fails every time. I have read that it could be a spamhaus problem. Any ideas?

Apologies, didn’t check the replies

This is the error I get on my Mac mail

Error box appears

Cannot send message using the server ‘email address appears here’
The attempt to send data to the server ‘SMTP.VIRGINMEDIA.COM failed
Select a different outgoing mail server from the list below or click ‘Try later’ to leave the message in your Outbox until it can be sent