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Mail to AOL addresses bouncing.

PCZero
One of my clients is having an issue with mail form his domain to any address at AOL.com being rejected with the following error...
This message was created automatically by mail delivery software. A message that you sent has not yet been delivered to one or more of its recipients after more than 24 hours on the queue on hostname.mydomain.com. The message identifier is: 1cV64Y-0006bB-M8 The subject of the message is: Download Links The date of the message is: Sat, 21 Jan 2017 19:31:54 -0500 The address to which the message has not yet been delivered is: trecipientname@aol.com host mailin-02.mx.aol.com [64.12.88.163] Delay reason: SMTP error from remote mail server after initial connection: 421 mtaig-mba02.mx.aol.com Service unavailable - try again later No action is required on your part. Delivery attempts will continue for some time, and this warning may be repeated at intervals if the message remains undelivered. Eventually the mail delivery software will give up, and when that happens, the message will be returned to you. Reporting-MTA: dns; hostname.mydomain.com
I read an old post about this and I THINK everything is set correctly. DKIM and SPF seem correct. Any ideas on how to resolve this issue?

Comments

5 comments

Date Votes
  • NOC_Serverpoint
    Hi, You can check the AOL error codes: AOL Postmaster - Error Codes -- 421 DNS:NR [LIST]
  • The Reverse DNS lookup for your IP address is failing. This could be a transient issue. Confirm the IP that sends your mail, and then check the rDNS of that IP using our troubleshooting tools. If it passes, please wait 24 hours and then try resending your mail before opening a support request. [LIST]
  • rDNS must be in the form of a fully qualified domain name. rDNS containing in-addr.arpa are not acceptable, as these are merely placeholders for a valid PTR record. rDNS consisting of IP addresses are also not acceptable, as they do not correctly establish the relationship between domain and IP address.
  • rDNS that may be similar to dynamic IP space (containing pool, dhcp, dyn, etc.) may be treated as suspect, and should therefore be changed to reflect a fully qualified domain name with standard reverse DNS. -- Also, you can signed up for AOLs "Feedback Loop", to get notified when they block your mail.
    • 0
  • PCZero
    I used Reverse DNS check and the IP being used does properly resolve to hostname.mydomain.com
    0
  • NOC_Serverpoint
    Then it would be better if you signup your email to AOLs "Feedback Loop"
    0
  • PCZero
    I went to that site and it made absolutely zero sense to me. It looks like the problem MIGHT be that the MTA is hosname.myserverdomain.com and the client is sending mail form his account on user@hisdomain.com, thus the domain names do not match. WOudl this cause the problem and if that si the cause, how do I address it?
    0
  • cPanelMichael
    mtaig-mba02.mx.aol.com Service unavailable - try again later

    Hello, This suggests AOL is blocking the message. Since you have stated that all guidelines are followed, you'd need to reach out to them directly to report the issue. The following page is the best place to start: AOL Postmaster - Home Thank you.
    0

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