strange sendmail problem (dsn=5.0.0, stat=Service unavailable)

Hi there,
I've got a strange problem regarding sendmail. I have a freebsd server running groupware with domain: domain.nl . At the office they have an exchange server also using domain.nl emailaddresses. Email is forwarded to the right server by an external mailserver and local email is handled by the virtusertable.
This is working well for about 100 users on the groupware server but I have one user who is unable to mail to the exchange server. All other users can do that, except this one. he gets an "dsn=5.0.0, stat=Service unavailable" error.
When I make a telnet connection to the exchange server from the groupware server it accepts the mail.
rogerbergerAsked:
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rogerbergerConnect With a Mentor Author Commented:
Well it was the spam filter on exchange which blocked the mail. Strange thing is that it didn't block the mail when I sent it from prompt using telnet.
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rogerbergerAuthor Commented:
Some extra info:
Nov  6 08:33:34 s3 sm-mta[41717]: rA67XX7Y041715: to=<wilko@domain.nl>, delay=00:00:01, xdelay=00:00:00, mailer=esmtp, pri=33802, relay=mail.domain.com. [213.125.155.154], dsn=2.0.0, stat=Sent ( <73127ACE71E2A2479C9E4DC436AA3BC0AED941@mainserver.domain.local> Queued mail for delivery)
Nov  6 12:42:23 s3 sm-mta[73607]: rA6BgGM4073605: to=<wilko@domain.nl>, ctladdr=<loredanacannas@domain.nl> (1013/1938), delay=00:00:07, xdelay=00:00:07, mailer=esmtp, pri=32306, relay=mail.domain.com. [213.125.155.154], dsn=5.0.0, stat=Service unavailable

and from prompt:

s3# telnet 213.125.155.154 25
Trying 213.125.155.154...
Connected to mail.domain.com.
Escape character is '^]'.
220 domain.nl Microsoft ESMTP MAIL Service, Version: 6.0.3790.4675 ready at  Wed, 6 Nov 2013 13:01:55 +0100
helo domain.nl
250 domain.nl Hello [83.96.158.162]
mail from: loredanacannas@domain.nl
250 2.1.0 loredanacannas@domain.nl....Sender OK
rcpt to: wilkotrenning@domain.nl
250 2.1.5 wilkotrenning@domain.nl
data
354 Start mail input; end with <CRLF>.<CRLF>
test4
.
250 2.6.0 <MAINSERVERrNKBqujsc00000031@domain.nl> Queued mail for delivery
quit
221 2.0.0 domain.nl Service closing transmission channel
Connection closed by foreign host.
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carlmdCommented:
Do you have a setup that says for whom your mail server will relay mail, and if so is the ip address of the problem pc in that list?
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rogerbergerAuthor Commented:
Yes,

I have a relay-domains file containing the IP and domainname of the exchange server. But that is working, all other users can send mail without a problem. It's just this one user who can't.
And it's not the exchange server because I can send email from this user from prompt (telnet port 25).
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carlmdCommented:
Did this ever work from this pc?

Have you checked the mail client (outlook?) settings?

Do you have a setting for the mailserver in the hosts file on that pc?

Does your sendmail configuration use any of the .db configurations or milters?
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rogerbergerAuthor Commented:
No, it's not a PC with Outlook. the sendmail side is a groupware server (egroupware) with 100 users and the other side is an exchange 2003 server.
secretariaat@domain.nl is located on the exchange server and so forwarded in the virtusertable on the groupware server.
What I forgot to mention is that for routing the mail to the correct server, I am using domain.com also on the exchange server.
only one user of these 100 groupware users gets an error 5.0.0 sending mail to secretariaat@domain.nl

Sendmail has a mostly standard configuration.

Thanks,
Roger
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rogerbergerAuthor Commented:
I found the problem myself and it wasn't really in sendmail but in exchange.
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