E-mails to recpients at one domain error 553 sorry, that domain isn't in my

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http://forums.cpanel.net – Hi, I have a very puzzling issue and I wondered if anyone can help with a bit of advice. I am trying to send an e-mail to three customers at one particular e-mail address and I get a Mail delivery failure with the following message - 553 sorry, that domain isn't in my list of allowed rcpthosts; no valid cert for gatewaying The real puzzle is that if I send an e-mail to just one recipient at this e-mail address it works fine. I only have this problem with this particular client and can send e-mails to multiple recipients at other e-mail addresses. I have been mulling this issue for some t ()