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01.29.2006 at 05:42PM PST, ID: 21714852
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6.8

Why is Verizon rejecting emails from Exchange

Asked by mhalp200 in Miscellaneous Software

Tags: , , ,

My organization never had any issues sending emails to users@verizon.net.  We were using sendmail 8.13.0 (Running on Redhat 9.0 Linux) as the mail server.  We just switched to Microsoft Exchange 2003.  Now Verizon is rejecting our emails.  The bounce message reads:

There was a SMTP communication problem with the recipient's email
server.  Please contact your system administrator.
    <fullyqualified.domain.com #5.5.0 smtp;550 You are not allowed to send
mail:sv16pub.verizon.net>
Reporting-MTA: dns; exchange1.mydomain.com


This happens from all email clinets - Eudora and Outlook.  

However, I can send an email message by telnetting to the mail server.  Then it is received without any problems:

telnet xxx.xxx.xxx.xxx 25

helo mydomain.com
mail from:user@mydomain.com
rcpt to:user@verizon.net
data

text
.

I spoke with Verizon and they were unable to assist me.  What does Verizon not like about the way that exchange (when accessed from an email client) is sending emails.

The Exchange Server has the same real world ip as the old Linux sendmail server.  It also has the same fully qualified domain name.  I don't see anything different iin the headers that I see when email is sent to an outside email address.

In addition, all other major isp's and email providers have no problem accepting our emails.  The only issue we have is with Verizon.

How can I tweak Exchange to get Verizon to accept emails?

This one belongs in the twilight zone!  If I could award more points, I would.

Thanks

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[+][-]01.29.2006 at 05:48PM PST, ID: 15820571

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About this solution

Zone: Miscellaneous Software
Tags: send, you, allowed, exchange
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Solution Provided By: MiguelSilvestre
Participating Experts: 2
Solution Grade: A
 
 
[+][-]01.29.2006 at 06:00PM PST, ID: 15820633

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[+][-]01.29.2006 at 06:06PM PST, ID: 15820654

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[+][-]01.30.2006 at 04:38AM PST, ID: 15823061

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[+][-]01.30.2006 at 06:01AM PST, ID: 15823560

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[+][-]01.30.2006 at 06:04AM PST, ID: 15823583

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[+][-]01.30.2006 at 06:13AM PST, ID: 15823635

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[+][-]01.30.2006 at 07:14AM PST, ID: 15824129

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[+][-]01.30.2006 at 11:58AM PST, ID: 15826967

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[+][-]01.30.2006 at 12:16PM PST, ID: 15827194

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