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:
[EMAIL PROTECTED] test1
@virtdomain.com [EMAIL PROTECTED]
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
[EMAIL PROTECTED] AND when the sender is from an external
machine.
If I send mail to [EMAIL PROTECTED] from a user account on
myrealdomain.com, it works. If I send mail to [EMAIL PROTECTED]
from a user account on myrealdomain.com, it works.
But if I send an email to [EMAIL PROTECTED] 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
[EMAIL PROTECTED] 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=<[EMAIL PROTECTED]>, size=919, class=0, nrcpts=1,
msgid=<[EMAIL PROTECTED]>, 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=<[EMAIL PROTECTED]>, 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=<[EMAIL PROTECTED]>, 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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