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AOL Users Can't Email to Companies Exchange Server

I have a customer that is having issues receiving emails from people that use AOL.  It has been an on going issue.  Sometimes the AOL emails come through and other times they will receive bounce back emails.  Below is the bounce back email.  Is there something that needs to be changed on the exchange side?


Your e-mail is being returned to you because there was a problem with
delivery.  The address which was undeliverable is listed in the section
labeled: "----- The following addresses had permanent fatal errors

The reason your mail is being returned to you is listed in the section
labeled: "----- Transcript of Session Follows -----".

The line beginning with "<<<" describes the specific reason your e-mail
not be delivered.  The next line contains a second error message which
is a
general translation for other e-mail servers.

Please direct further questions regarding this message to the e-mail
administrator or Postmaster at that destination.

--AOL Postmaster

   ----- The following addresses had permanent fatal errors -----
    (reason: 451 4.4.1 reply: read error from mail.domain.com.)
    (reason: )

   ----- Transcript of session follows -----
451 4.4.1 reply: read error from mail.domain.com.
<KFrost@domain.com>... Deferred: Connection timed out with
<kwendt@domain.com>... Deferred: Connection timed out with
Message could not be delivered for 3 hours
Message will be deleted from queue
1 Solution
One of the servers on the way is having problems relaying to the next server down the line.
this is what the error 451 means

451      Requested action aborted: local error in processing

Not sure what that could be, The error could be caused from anything from connection times out, couldn't find a resolution for the server etc.

You should probably check if the message even hits your mail server, use the time and the sender/receiver to track down the message in your server logs. If you can't find it, chances are that the message doesn't even get to your mail server.
You need to check with the owner of the server that sends the error for more details

Alan HardistyCommented:
What firewall do you have and is it on the latest firmware / software?

Are you using a Cisco or a Sonicwall device?  If you are you need to make sure you have SMTP fixup disabled.
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jmkotmanAuthor Commented:
its a pix 501 installed.  Nothing has changed really and all of a sudden AOL addresses can't send us emails.
Alan HardistyCommented:
Do you have SMTP fixup enabled on your PIX?  If you do, please disable it as it causes more problems than it is meant to fix, write the configvto memory and reboot it.

Then see if your problems go away.
Which server sends the error message? Is it your mail server or a different server? can you do a tracert to that server? How many hops does it go to?
I am having the same issue, but using a SonicWall device. Any ideas?
Alan HardistyCommented:
Sonicwalls have SMTP Inspection enabled too - you need to disable it.

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