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I'm having few problems with mail for my domain I run a Mailinglist on Listserv and I have just been automatically unsubscribed from it with this message:

"Last error was: 5.5.1 503 5.5.1 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server."

This refers to my own email address which is hosted on Kerio on my dedicated Windows box. The domain *is* of course set up on that server (it is therefore local, isn't it?). Relaying is allowed only for certain IP addresses, via SMTP authentication or POP before SMTP.
I am having very few problems aside from that and I can send and receive emails just fine...
Any pointers as to where to dig deeper?



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