Exchange 5.5.0 NDR - Never Seen Before

When Sending a an email from to I get the below response. I have spent a lot of time working with exchange and know most of the NDRs but this one is new to me. Any Ideas

Your message did not reach some or all of the intended recipients.

Subject: [Ticket #80] Updated: remote access problems  
Sent: 18/05/2009 10:35

The following recipient(s) could not be reached: on 18/05/2009 10:37
  There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
  < #5.5.0 smtp;550 Error: rule body.05 contains a CIALIS variant dropping this.>
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Stephen CroftConnect With a Mentor Technical ArchitectCommented:
As a guess, the recipient server ( is dropping your email as it thinks it is spam.

Speak to their network administrator regarding this.

The MX for that domain is pointing to POST FIX...
so may be some issue with them...
is your server exchange 2003 0r 2007 ?
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is there any transport rule on the server?
disable it and then try sending mail
restart the transport service after disabling it
octreeAuthor Commented:
It seems that this was a problem with the firewall dropping traffic at the remote location. Thank you all for your repsonses.
Stephen CroftTechnical ArchitectCommented:
he shoots, he scores ;)

seriously, one comment I would make is that I hope the domain names you posted are fictitious and not real ;) Never (ever) post real hostnames / IP's / domain names etc. Just in case ;)
Great ;-)
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