email problem, one client only
I have a client who wants their email diverting to an existing email address. I already have a few clients set up doing that and it works perfectly. Neither I nor any clients apart from that one are having email problems just now, and I can't find what may be causing the problem.
I have tried adding one of my email addresses to the list of forwarding addresses, then sent an email to the client's address from one of my private email addresses - it bounces with Relay access denied in the bounce message.
So far as I can see, the email setup in ISPConfig is exactly the same as for all the other clients. Why would relay access be denied? Where do I look for a cure?
The logs are not telling me anything is untoward, just the usual lengthy list of E. Europeans probing for a spam relay.