We have a client whos mail Zimbra refuses to recieve.
The clients mail is for domain xclient.com. There is and MX record for xclient.com that points to mail.xclient.com which then resolves to an IP. Howver, xclient.com has no valid DNS record, no IP. This seems to cause Zimbra to refuse mail from them.
Is there a way to fix or workaround this? We really want to get mail from our client.