Here is the AOL bounce. I thought this problem had been resolved but maybe not. The email address has been deleted to protect the innocent.

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MDaemon Delivery Status Notification - http://www.altn.com/dsn/
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The attached message had PERMANENT fatal delivery errors.

After one or more unsuccessful delivery attempts the attached message has
been removed from the MDaemon mail queue on this server. The number and
frequency of delivery attempts are determined by local configuration.

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YOUR MESSAGE WAS NOT DELIVERED TO ONE OR MORE RECIPIENTS
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Failed address: @aol.com

--- Session Transcript ---
Tue 2012-10-16 20:11:16: Parsing message
Tue 2012-10-16 20:11:16: * From: noreply@classcreator.net
Tue 2012-10-16 20:11:16: * To: @aol.com
Tue 2012-10-16 20:11:16: * Subject: Replying to a Forum Message?
Tue 2012-10-16 20:11:16: * Size (bytes): 2566
Tue 2012-10-16 20:11:16: * Message-ID: <1383442600.21545.1350432606912.JavaMail.CCWEB3$@CCWEB3>
Tue 2012-10-16 20:11:16: Attempting SMTP connection to [aol.com]
Tue 2012-10-16 20:11:16: Resolving MX records for [aol.com] (DNS Server: 69.41.160....
Tue 2012-10-16 20:11:17: * P=015 S=000 D=aol.com TTL=(14) MX=[mailin-02.mx.aol.com]
Tue 2012-10-16 20:11:17: * P=015 S=001 D=aol.com TTL=(14) MX=[mailin-03.mx.aol.com]
Tue 2012-10-16 20:11:17: * P=015 S=002 D=aol.com TTL=(14) MX=[mailin-04.mx.aol.com]
Tue 2012-10-16 20:11:17: * P=015 S=003 D=aol.com TTL=(14) MX=[mailin-01.mx.aol.com]
Tue 2012-10-16 20:11:17: Attempting SMTP connection to [mailin-02.mx.aol.com:25]
Tue 2012-10-16 20:11:17: Resolving A record for [mailin-02.mx.aol.com] (DNS Server: 69.41.160....
Tue 2012-10-16 20:11:17: * D=mailin-02.mx.aol.com TTL=(14) A=[205.188.155.110]
Tue 2012-10-16 20:11:17: * D=mailin-02.mx.aol.com TTL=(14) A=[205.188.190.1]
Tue 2012-10-16 20:11:17: * D=mailin-02.mx.aol.com TTL=(14) A=[64.12.90.65]
Tue 2012-10-16 20:11:17: * D=mailin-02.mx.aol.com TTL=(14) A=[64.12.137.162]
Tue 2012-10-16 20:11:17: * D=mailin-02.mx.aol.com TTL=(14) A=[64.12.139.193]
Tue 2012-10-16 20:11:17: * D=mailin-02.mx.aol.com TTL=(14) A=[205.188.59.193]
Tue 2012-10-16 20:11:17: * D=mailin-02.mx.aol.com TTL=(14) A=[205.188.103.1]
Tue 2012-10-16 20:11:17: Randomly picked 64.12.90.65 from list of A records
Tue 2012-10-16 20:11:17: Attempting SMTP connection to [64.12.90.65:25]
Tue 2012-10-16 20:11:17: Waiting for socket connection...
Tue 2012-10-16 20:11:17: * Connection established (69.41.172.242:1881 -> 64.12.90.65:25)
Tue 2012-10-16 20:11:17: Waiting for protocol to start...
Tue 2012-10-16 20:11:17: <-- 220-mtain-ma11.r1000.mx.aol.com ESMTP Internet Inbound
Tue 2012-10-16 20:11:17: <-- 220-AOL and its affiliated companies do not
Tue 2012-10-16 20:11:17: <-- 220-authorize the use of its proprietary computers and computer
Tue 2012-10-16 20:11:17: <-- 220-networks to accept, transmit, or distribute unsolicited bulk
Tue 2012-10-16 20:11:17: <-- 220-e-mail sent from the internet.
Tue 2012-10-16 20:11:17: <-- 220-Effective immediately:
Tue 2012-10-16 20:11:17: <-- 220-AOL may no longer accept connections from IP addresses
Tue 2012-10-16 20:11:17: <-- 220 which no do not have reverse-DNS (PTR records) assigned.
Tue 2012-10-16 20:11:17: --> EHLO mail.classcreator.net
Tue 2012-10-16 20:11:17: <-- 250-mtain-ma11.r1000.mx.aol.com
Tue 2012-10-16 20:11:17: <-- 250 DSN
Tue 2012-10-16 20:11:17: --> MAIL From:
Tue 2012-10-16 20:11:17: <-- 250 2.1.0 Ok
Tue 2012-10-16 20:11:17: --> RCPT To:
Tue 2012-10-16 20:11:17: <-- 550 5.1.1 : Recipient address rejected: aol.com
Tue 2012-10-16 20:11:17: --> QUIT
--- End Transcript ---

This message was delivered by MDaemon - http://www.altn.com/MDaemon/

The relevant portion of the bounce message is the line "Recipient address rejected: aol.com" near the end. That line is telling you that the reason the bounce happened is because the email address to which you were sending is not valid. The rest is just informational.

Thanks, I sent her an email outside the web site a few days ago so she must have changed it since. Email changes seem to be happening a lot recently because of spam, hacking, etc.

Woody

Eric B Bassey wrote:

Typically, email servers which have been sent messages for email accounts or addresses which do not exist on those servers return a bounce message to the sender. Our system directs those bounce messages to a file which is then processed so that relevant bounce messages to your site can be displayed to you within the site.

Ok cool. Now I understand the methodology. Thanks for the extra explanation.