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Dear all,

I've just installed Kerio MailServer in one of my server of my compagny.

I've setup the MX corectly "" and also link my Local IP to a Public IP linked it on hostname witht the public IP on my account provider.

I've enable also the webmail and it's working.

I can send email to outside provider but I cannot received the personn from outside who wants to send me an email received this error message :

This is the Postfix program at host

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<administrateur<_at_>>: host[XXX.XXX.XX.XXX] said: 551 User
not local. Authentication required for relay (in reply to RCPT TO command)

I do not know where I should make some modification and I'm blocking actually.

Thanks a lot for your kind support

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Good evening,

Is anyone can help me

Messages: 769
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You have set up an MX record for a domain, but the domain isn't configured in KMS? That's usually the reason you get "relay not allowed" in mail servers (unless you really tried to relay through it).

Is your domain or The former has a mail server which claims to be " ArGoSoft Mailserver SMTP module" when I connect to it. I don't know if I'm on a wild goose chase here though ...
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