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=<root@localhost.localdomain>, size=327, class=0, nrcpts=1, msgid=<200604050211.k352Blue009455@localhost.localdomain>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain []
Apr  4 21:11:48 s1 sendmail[9455]: k352Blue009455: to=g-jones2@ti.com, ctladdr=root (0/0), delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=30034, relay=[] [], dsn=2.0.0, stat=Sent (k352BlNC009456 Message accepted for delivery)
Apr  4 21:11:49 s1 sendmail[9458]: k352BlNC009456: to=<g-jones2@ti.com>, ctladdr=<root@localhost.localdomain> (0/0), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=120327, relay=frio.ext.ti.com. [], 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=<root@localhost.localdomain>, 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 MAILER-DAEMON@localhost.localdomain  Tue Apr  4 21:11:49 2006
Date: Tue, 4 Apr 2006 21:11:49 -0500
From: Mail Delivery Subsystem <MAILER-DAEMON@localhost.localdomain>
To: <root@localhost.localdomain>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

This is a MIME-encapsulated message


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

   ----- 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

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; g-jones2@ti.com
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

Content-Type: message/rfc822

Return-Path: <root@localhost.localdomain>
Received: from localhost.localdomain (localhost.localdomain [])
        by localhost.localdomain (8.13.1/8.13.1) with ESMTP id k352BlNC009456
        for <g-jones2@ti.com>; 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 g-jones2@ti.com; Tue, 4 Apr 2006 21:11:47 -0500
Date: Tue, 4 Apr 2006 21:11:47 -0500
From: root <root@localhost.localdomain>
Message-Id: <200604050211.k352Blue009455@localhost.localdomain>
To: g-jones2@ti.com



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?


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the "from" address on that email is root@localhost.localdomain, "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.

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You can use the command below to get transcript of the SMTP conversation.
[ it is necessary in sendmail-8.12+ to run it as toot]

( echo "subject: test"; echo ) | sendmail -v g-jones2@ti.com

If the remote server does not like "this host name" being "localhost.localdomain" (the most likely reason) then you can make you system report proper fully qualified domain name (fqdn) of "this host"  [it is dustribution dependended]. Command to get the name:
hostname --fqdn
hostname -f
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