Question : Unable to relay to certain domains

I recently started having issues sending mail to certain e-mail addresses.  I get the following errors in maillog:

Apr  4 21:11:48 s1 sendmail[9456]: k352BlNC009456: from=domain>, size=327, class=0, nrcpts=1, msgid=<200604050211.k352Blue009455@localhost.localdomain>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Apr  4 21:11:48 s1 sendmail[9455]: k352Blue009455: [email protected], ctladdr=root (0/0), delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=30034, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (k352BlNC009456 Message accepted for delivery)
Apr  4 21:11:49 s1 sendmail[9458]: k352BlNC009456: to=, ctladdr=caldomain> (0/0), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=120327, relay=frio.ext.ti.com. [192.94.94.25], dsn=5.0.0, stat=Service unavailable
Apr  4 21:11:49 s1 sendmail[9458]: k352BlNC009456: k352BnNC009458: DSN: Service unavailable
Apr  4 21:11:49 s1 sendmail[9458]: k352BnNC009458: to=main>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31577, dsn=2.0.0, stat=Sent

I get the following bounce back message:

Message 1:
From [email protected]caldomain  Tue Apr  4 21:11:49 2006
Date: Tue, 4 Apr 2006 21:11:49 -0500
From: Mail Delivery Subsystem ocaldomain>
To: n>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
        boundary="k352BnNC009458.1144203109/localhost.localdomain"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

This is a MIME-encapsulated message

--k352BnNC009458.1144203109/localhost.localdomain

The original message was received at Tue, 4 Apr 2006 21:11:48 -0500
from localhost.localdomain [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----

    (reason: 554 frio.ext.ti.com ESMTP not accepting messages)

   ----- Transcript of session follows -----
... while talking to brazos.ext.ti.com.:
<<< 554 brazos.ext.ti.com ESMTP not accepting messages
... while talking to llano.ext.ti.com.:
>>> QUIT
<<< 554 llano.ext.ti.com ESMTP not accepting messages
... while talking to cypress.ext.ti.com.:
>>> QUIT
<<< 554 cypress.ext.ti.com ESMTP not accepting messages
... while talking to pecos.ext.ti.com.:
>>> QUIT
<<< 554 pecos.ext.ti.com ESMTP not accepting messages
... while talking to frio.ext.ti.com.:
>>> QUIT
<<< 554 frio.ext.ti.com ESMTP not accepting messages
554 5.0.0 Service unavailable

--k352BnNC009458.1144203109/localhost.localdomain
Content-Type: message/delivery-status

Reporting-MTA: dns; localhost.localdomain
Received-From-MTA: DNS; localhost.localdomain
Arrival-Date: Tue, 4 Apr 2006 21:11:48 -0500

Final-Recipient: RFC822; [email protected]
Action: failed
Status: 5.5.0
Diagnostic-Code: SMTP; 554 frio.ext.ti.com ESMTP not accepting messages
Last-Attempt-Date: Tue, 4 Apr 2006 21:11:49 -0500

--k352BnNC009458.1144203109/localhost.localdomain
Content-Type: message/rfc822

Return-Path: n>
Received: from localhost.localdomain (localhost.localdomain [127.0.0.1])
        by localhost.localdomain (8.13.1/8.13.1) with ESMTP id k352BlNC009456
        for ; Tue, 4 Apr 2006 21:11:48 -0500
Received: (from root@localhost)
        by localhost.localdomain (8.13.1/8.13.1/Submit) id k352Blue009455
        for [email protected]; Tue, 4 Apr 2006 21:11:47 -0500
Date: Tue, 4 Apr 2006 21:11:47 -0500
From: root n>
Message-Id: <200604050211.k352Blue009455@localhost.localdomain>
To: [email protected]

test1
test2


--k352BnNC009458.1144203109/localhost.localdomain--


Messages to other addresses seem to get delivered OK. I also have no issue receiving any messages.

I am running 8.13 sendmail on FC3 Linux.

Why has this suddenly started happening when I have had no issue prior to yesterday?

Greg

Answer : Unable to relay to certain domains

the "from" address on that email is [email protected], "localhost.localdomain" is not a valid domain name. TI.com's server probably were updated recently (when you started having the problem) to not accept mail from bogus domains.