Sounds like they're blocking you.
Try connecting via telnet on port25 to see what gives.
Jerzy
> 
> From: "Chris H" <[EMAIL PROTECTED]>
> Date: 2002/05/06 Mon AM 10:58:22 EDT
> To: "Exchange Discussions" <[EMAIL PROTECTED]>
> Subject: SMTP 550 Error
> 
> I am getting this error sending to one domain:
> 
> The original message was received at Thu, 2 May 2002 13:05:49 -0400 (EDT)
> from mail.ourdomain.com [216.xxx.xxx.xxx]
> 
> ----- The following addresses had permanent fatal errors -----
> <[EMAIL PROTECTED]>
> 
> (reason: 550 Access denied)
> 
> The definition I find for SMTP 550 is that the user is unknown or the
> account does not exist.
> 
> However, if I send from hotmail or yahoo as a test, the mail gets to the
> user no problems. Access denied does not sound like an error with locating
> the user name/account by their recieving server. it sounds more like they
> are not accepting incoming mail from us for some reason. I do not see our
> domain blacklisted in ORBS or anything similair using Sam Spade to check
> their databases.
> 
> 
> "Beaten paths are for beaten men."
>     Eric A. Johnston (1842 - 1914) US journalist, short-story writer.
> 
> 
> 
> 
> 
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