RE: message blocked by

  • From: "John T \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
  • To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 28 Nov 2005 15:53:31 -0800

I was going to say:

=Without seeing more information, I have a couple of guesses in order:
=1. Some one you know (or one of your users knows) is infected with a virus,
is sending =out virus laden messages and they are pretending to be from your
user, those =messages are bouncing back to your server as undeliverable, and
your server is then =bouncing them as unknown.

But while investigating number 2 I found you have server and DNS problems.

ERROR: One or more of your mailservers does not accept mail to
postmaster@xxxxxxxxxxxxxxxxxxxxxx Mailservers are required (RFC822 6.3,
RFC1123 5.2.7, and RFC2821 4.5.1) to accept mail to postmaster.'s postmaster response: >>> RCPT
TO:<postmaster@xxxxxxxxxxxxxxxxxxxxx> <<< 550 5.7.1 has been
blocked by

WARNING: One or more of your mailservers does not accept mail to
abuse@xxxxxxxxxxxxxxxxxxxxxx Mailservers are expected by RFC2142 to accept
mail to abuse.'s abuse response:
    >>> RCPT TO:<abuse@xxxxxxxxxxxxxxxxxxxxx>
    <<< 550 5.7.1 has been blocked by

WARNING: One or more of your mailservers does not accept mail in the domain
literal format (user@[]). Mailservers are technically required
RFC1123 5.2.17 to accept mail to domain literals for any of its IP
addresses. Not accepting domain literals can make it more difficult to test
your mailserver, and can prevent you from receiving E-mail from people
reporting problems with your mailserver. However, it is unlikely that any
problems will occur if the domain literals are not accepted (mailservers at
many common large domains have this problem).'s postmaster@[] response:
    >>> RCPT TO:<postmaster@[]>
    <<< 550 5.7.1 has been blocked by

Has your IP addresses changed or anything changed?

If not, you better run and found out what is going on.

John T
eServices For You

> -----Original Message-----
> From: Mark Morgan [mailto:mmorgan@xxxxxxxxxxxxxxxxxxxxx]
> Sent: Monday, November 28, 2005 2:48 PM
> To: [ExchangeList]
> Subject: [exchangelist] message blocked by
> I have Exch 2003 sp2, today messages sent to my server are getting bounced
> back with a message
> user@xxxxxxx
> You do not have permission to send to this recipient, for assistance
> contact your admin.
> < # 5.7.1 smtp;550 5.7.1 has been blocked by
> I am not have any connection with we are a small local
> hospital.
> Any Ideas?
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