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Date:      Wed, 23 Oct 2002 17:46:05 -0400 (EDT)
From:      Incoming Mail List <mailist@whoweb.com>
To:        freebsd-questions@FreeBSD.ORG
Subject:   Sendmail Help Needed
Message-ID:  <200210232146.RAA26222@whoweb.com>

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I've got a problem with the latest sendmail (8.12.6) that I can't
overcome or find documentation to help me out with the issue.
I'm getting stat=Host unknown (Unknown error: 275) errors when
attempting to send mail to LHS addresses listed in the
virtusertable file.


myrealdomain.com - my FreeBSD server running DNS and sendmail
                   111.222.333.444

virtdomain.com   - a virtual domain name administered under, and with
                   the same IP address as myrealdomain.com.
                   111.222.333.444

notmydomain.com  - an external site not administered by me or under
                   my control.  This domain name cannot be resolved
                   by DNS.  However, the mail server MX record
                   associated with the domain (mail.notmydomain.com) 
                   CAN be resolved to an IP address.
                   999.999.999.6



In my virtusertable I have the virtual host listed as:
test1@virtdomain.com        test1
@virtdomain.com             user@notmydomain.com


test1 is a real user account on myrealdomain.com


The only time I get the "Host unknown" error is when I attempt to
send mail to a virtual address that gets rewritten to
user@notmydomain.com AND when the sender is from an external
machine.

If I send mail to user@notmydomain.com from a user account on
myrealdomain.com, it works.  If I send mail to anyone@virtdomain.com
from a user account on myrealdomain.com, it works.

But if I send an email to anyone@virtdomain.com from any other
external machine not associated with my server, it fails with
stat=Host unknown (Unknown error: 275).  Additionally, any attempt
to notify the sender of the error fails as well.


I know it looks like a DNS issue, but if that were the real cause
it would seem that I wouldn't be successful sending mail to
user@notmydomain.com from myrealdomain.com either.  Yet that works
fine.

Can anyone help me sort through this?  I can't find any reference
to (Unknown error: 275) in any of the sendmail source code which
leads me to believe it is coming from the destination mail
delivery program.


Log messages included below have the domain names changed to the
example names made up in this email message.  The external.com
domain name is any machine (even your own) that is not part of
my network.  



Oct 23 16:30:40 myrealdomain sendmail[21014]: g9NKUdxg021014:
from=<user@external.com>, size=919, class=0, nrcpts=1,
msgid=<3DB705B0.C1598837@external.com>, proto=ESMTP, daemon=MTA,
relay=mail.external.com [161.114.1.209] (may be forged)

Oct 23 16:30:40 myrealdomain sendmail[21019]: g9NKUdxg021014:
to=<test@virtdomain.com>, delay=00:00:00, xdelay=00:00:00,
mailer=esmtp, pri=30913, relay=mail.notmydomain.com., dsn=5.1.2,
stat=Host unknown (Unknown error: 275)

Oct 23 16:30:40 myrealdomain sendmail[21019]: g9NKUdxg021014:
g9NKUexg021019: DSN: Host unknown (Unknown error: 275)

Oct 23 16:30:40 myrealdomain sendmail[21019]: g9NKUexg021019:
to=<user@external.com>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp,
pri=31943, relay=mail.external.com., dsn=5.1.2, stat=Host unknown
(Unknown error: 275)

Oct 23 16:30:40 myrealdomain sendmail[21019]: g9NKUexg021019:
g9NKUexh021019: return to sender: Host unknown (Unknown error: 275)

Oct 23 16:30:41 myrealdomain sendmail[21019]: g9NKUexh021019: to=root,
delay=00:00:01, xdelay=00:00:00, mailer=local, pri=32967, dsn=2.0.0,
stat=Sent



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