the Bt smtp server is not delivering some of my emails with the message
Google tried to deliver your message, but it was rejected by the relay smtp.btinternet.com by smtp.btinternet.com. [18.104.22.168].
The error that the other server returned was:
421 Too many messages (22.214.171.124) from 126.96.36.199
So far it seems only one email address is affected but unfortuntely it is my wife's email address! (a gmail address) other gmail addresses work fine though and it's not all messages just some.
I don't use the SMTP server for bulk eamils so the rejection is not valid