Does anybody here know this mail problem?

I have a client who can't send emails from pop3 accounts on the server to a russian email service. This is the message returned:

Your message is being returned unprocessed.

The following annotated envelope headers illustrate the error(s):

Error in "rcvdfrom" envelope address:

. ([xx.xxx.xx.xxx]:12250 "EHLO host.server.com" ident: "NO-IDENT-SERVICE[2]" whoson: "-unregistered-"
smtp-auth: TLS-CIPHER: "EDH-RSA-DES-CBC3-SHA keybits 168/168 version TLSv1/SSLv3" TLS-PEER-CN1: )
^
^-illegal subdomain in domain, probably extra '.' at the end of the address
\-illegal subdomain in domain, probably extra '.' at the end of the address

Hoping for some input.

Thanks
John

cPanel.net Support Ticket Number: