I am getting a "bogus MX Records" msg back when I email a user in Exchange

When I email a user I get the following message back from my mail server
"You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            #5.7.1 smtp;554 5.7.1 Service unavailable; Sender address blocked using bogusmx.rfc-ignorant.org; Domain has demonstrably bogus MX records>"

The user can email me, when I "reply" I get the same error. I could email them a few months ago.

From googling it it may be a problem with their ISP not allowing reverse lookups. Is there anything I can do on my end to resolve it?
Appreciate any assistance.
Cyril_CarriggAsked:
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grbladesCommented:
That looks like a RBL lookup. What is the domain you are sending your email from and what is the servers IP address. If you dont want to post it here there is a 'test' email address listed in my profile which you can send it to. Lust post here when it has been sent.
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Cyril_CarriggAuthor Commented:
I'm sending from creganna.com mail server ip 172.21.1.19
Sending email to j.rouchier@completel.fr

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Cyril_CarriggAuthor Commented:
correction mail is being sent to j.rouchier@biomatech.fr
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grbladesCommented:
Your domain has two mail servers listed :-

creganna.com.           86400   IN      MX      20 mxbackup4.webhostingireland.ie.
creganna.com.           86400   IN      MX      15 newmail.creganna.com.

The first one is fine but mxbackup4.webhostingireland.ie points to a CNAME (alias) :-
mxbackup4.webhostingireland.ie. 298 IN  CNAME   mx1.webhostingireland.ie.

According to the RFC standard the MX entry should point to a host which has an A (IP address) record and it is not permitted to post to a record which is a CNAME. This is why you got put on the RBL with rfc-ignorant.

You need to change
mxbackup4.webhostingireland.ie. 298 IN  CNAME   mx1.webhostingireland.ie.
to
mxbackup4.webhostingireland.ie. 298 IN  A 81.17.241.217

Then 24 hours after the change has been made (to allow time for the change to propegate) go to http://www.rfc-ignorant.org/tools/detail.php?domain=creganna.com&submitted=1198636708&table=bogusmx and follow the instructions for getting yourself removed from the list.
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grbladesCommented:
I am guessing you are a customer of webhostingireland?
In that case you cant change the record yourself so I would contact their customer support and say to them as a web hosting company they should know what they are doing andnot make such a mistake.

In the meantime you can change :-
creganna.com.           86400   IN      MX      20 mxbackup4.webhostingireland.ie.
to
creganna.com.           86400   IN      MX      20 mx1.webhostingireland.ie.
This will stop the error and effectivly point to the same machine as the backup.
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Cyril_CarriggAuthor Commented:
Great thanks for the quick answer.
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