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modest911

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#5.5.0 smtp;550 Invalid recipient

I have searched and searched for answer to my question and I have done a set type=MX on the recipient - and got a reply back - this is the message I am geeting when send to recipient

here was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <******.*****.com #5.5.0 smtp;550 Invalid recipient <*****@******.com>>


I was able to send to the recipient from my yahoo account fine - But cannot send succesfully from my exchange server - It always gets bounced back - I made sure my server was in the DNS foward look up - If you cant tell I am kind of new to this and I cannot find a valid answer and how to correct it -


I think the recipient is using an external mail server that is hosted by "speedfactory" - I was able to find this out by using Reverse DNS look up - It seems I have all the pieces - I just cannot figure out how to put them together - Thanks in advance -
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Yes I can send to other addressess fine -

No there is no spelling mistakes in the e mail addy

Thats the thing how will I know what there mail server name is? I dont think they have an IT person at there location that I can talk to - Is there any other way for me to figure out what the name of there mail server is?
Okay here is the update - I was able to telnet into what I think the receipt is using for a mail server - Before I was trying to use clients.speedfactory.net and open on port 25 but I didnt get any responce - Today I used the ip that I received from the revers dns look up and was able to open them up on port 25 ?!?! now what
But the responce I got when telnetting into the ip was ESMTP "domain name" MDaemon 7.1.0
I'm having the same problem.  I can send from my exchange server to the recipient, but not from my clients exchange server to the recipient.  It fires back the following NDR straight away.
I can telnet to the recipient's mx record on port 25 from my clients server no problem.

'Some, One - ECS' on 02/06/2008 10:00
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <My Server #5.5.0 smtp;550-Invalid recipient
<some.one@somewhere.co.uk>