Within the last couple of weeks, I have noticed that when I send a message to At&t text service, I get a reply that says unable to send for the past 4 hours, will keep trying until message is 5 days old.  I can send them thru Hotmail and they go right thru.  I can also send them thru the centuryel portal page and they go right thru.  This only appears to be with At&t going thru windows live mail on my CenturyTel account.  Other cellular texting messages appear to work just fine, example Verizon.  Here is an example of a return mail.

**********************************************
    **      THIS IS A WARNING MESSAGE ONLY      **
    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
    **********************************************

The original message was received at Sat, 10 Aug 2013 18:04:05 GMT
from 72-160-90-39.dyn.centurytel.net [72.160.90.39]

   ----- Transcript of session follows -----
451 4.4.1 reply: read error from mx.txt.att.net.
<*** Email address is removed for privacy ***>... Deferred: Connection reset by mx.txt.att.net.
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old

X-Authenticated-User: sts323.centurytel.net
X-Envelope-From: *** Email address is removed for privacy ***
Return-Path: <*** Email address is removed for privacy ***>
Received: from Bobs (72-160-90-39.dyn.centurytel.net [72.160.90.39])
(authenticated bits=0)
by mail941c35.carrierzone.com (8.13.6/8.13.1) with ESMTP id r7AI419G005582
for <*** Email address is removed for privacy ***>; Sat, 10 Aug 2013 18:04:05 GMT
Message-ID: <6CCB2FF38A6B4E65ABA88F5B21B9BF47@Bobs>
From: "Boo" <*** Email address is removed for privacy ***>
To: <*** Email address is removed for privacy ***>
Subject:
Date: Sat, 10 Aug 2013 11:03:57 -0700
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_0050_01CE95B9.4F924F00"
X-Priority: 3
X-MSMail-Priority: Normal
Importance: Normal
X-Mailer: Microsoft Windows Live Mail 16.4.3505.912
X-MimeOLE: Produced By Microsoft MimeOLE V16.4.3505.912
X-CSC: 0
X-CHA: v=1.1 cv=93ttuxsYP/vX6Bf2VsSXuIHKFRXt6Mh3Ze9zSPghnyo= c=1 sm=1
a=3WPTVEtZbjMA:10 a=2A+jrBfIRYE0Hb5S0Ru+QQ==:17 a=nS36O97Bj3wUElCrIrAA:9
a=wPNLvfGTeEIA:10 a=xy_sZqEVzRNSZT0rrO0A:9 a=_W_S_7VecoQA:10
a=UF909vspFEgA:10 a=k5dt0Wh1TMwA:10 a=2A+jrBfIRYE0Hb5S0Ru+QQ==:117
X-CTCH-Spam: Unknown
X-CTCH-RefID: str=0001.0A020206.52068095.00FD,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0

Any Suggestions?

Thanks Bob