Can't send email to aol from Outlook client on Exchange server

This is a problem at least as recent as today or yesterday.

Kickback message reads: rejected your message to the following e-mail addresses:
ChangedNameForThisPost (changednameforthis <> gave this error:
: AOL will not accept delivery of this message.
There's a problem with the recipient's mailbox. Please try resending this message. If the problem continues, please contact your helpdesk.

This happens with all AOL accounts I've sent to today or yesterday, about 6 or 7.
I have sent to all these people with no problem for years.
I can send from an aol account to my outlook/exchange mailbox, but sending back doesn't work even using ReplyTo.

I can send to one that I tried from my gmail account.

--ron hicks
Ronald HicksConsultantAsked:
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Are you on any blacklists?
Also check AOL's ability to check your rDNS :

As well as AOL's blacklist :

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Ronald HicksConsultantAuthor Commented:
Checked out all three:  all OK.  Have reported it to AOL admins.
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Hope you're not holding your breath!

Did you look at the SMTP logs on your Exchange server to see if they give any additional info?
Ronald HicksConsultantAuthor Commented:
Glad I'm not holding my breath; still waiting.  

No, not checked SMTP logs.  Not done before; if you can step me through it, I'd be glad for the time-saving help.
First you would need logging turned on, if it isn't.  I recommend keeping logging on all the time on the transport roles; the logs flip over after 30 days.

In the Exchange console, go to your send connectors.  Probably only have one; go in to its properties and on the first/general page, set protocol logging level to verbose.  If it's already set, then we can check the logs now.  If it's not set, set it, give it a minute or two, and send another email to

To check the logs, go to C:\Program Files\Microsoft\Exchange Server\V14\TransportRoles\Logs\ProtocolLog\SmtpSend.  You'll see all of the log files for the past 30 days.  Go to the date when you sent the email to AOL.  Due to time zones and UTC, you may have to look in the log before the date as they roll over at different times.

Then search the log for and start reading.  The log file is broken out in to columns; the third column is the session ID.  Each session is one email.  So when you find the AOL email, grab all of the lines that have the same session ID.  Sometimes if more than one email is sent at the same time, you'll see session IDs that co-mingle with each other.  

Look at the end of each line for any information that might be helpful.  You might see an error around the mail from, rcpt to or data lines.  If it's not helpful, post the relevant lines up here and you can blank out the domains and emails.
Ronald HicksConsultantAuthor Commented:
Never mind helping with checking SMTP logs (til nest time)  I just sent test messages to AOL and they worked. So I'm concluding that there was a problem on their end and that they have fixed it.
Ronald HicksConsultantAuthor Commented:
Many thanks!!  Ron Hicks
Great!  No problem.  I'd still turn logging on.  Good for future troubleshooting.
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