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AOL - Bounce Message Error Codes


Error codes starting with 4xxx are temporary problems. Error codes starting with 5xxx are permanent / fatal errors:

421 CON:B1  Click for help & fix
The IP address has been tempfailed due to a spike in unfavorable e-mail statistics.
421 DNS:NR  Click for help & fix
The Reverse DNS lookup for your IP address is failing. This could be a transient issue. Confirm the IP that sends your mail. Then check the rDNS of that IP using our troubleshooting tools. If it passes, please wait 24 hours and re-try before opening a support request.
  • 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 should be changed to reflect a fully-qualified domain name with standard reverse DNS.
421 DYN:T1  Click for help & fix
The IP address you are sending from has been temporarily rate limited due to lack of whitelisting, unexpected changes in volume, or poor IP reputation.
421 DYN:T2  Click for help & fix
The IP address you are sending from has been asked to delay email delivery to AOL due to a temporary issue with our mail system. This will be corrected by AOL and no changes should be necessary on your part. If the issue persists, feel free to open a support request with our postmasters.
421 HVU:B2  Click for help & fix
There is at least one URL or domain in your e-mail that is generating substantial complaints from AOL members. Resolution will require opening a support request.
421 RLY:B3  Click for help & fix
The IP address you are sending from has been temporarily rate limited due poor reputation. Please visit this page for tips to improve your IP reputation
421 RLY:CH  Click for help & fix
A computer or computer(s) on your network may be compromised and is sending mail that matches the signature of known spam. Ensure you have a fully qualified domain name, apply for a complaint feedback loop, as well as scanning your systems and securing any compromises before opening a support request.
421 RLY:CH2  Click for help & fix
Your IP address has generated AOL member complaints and your mail system may be compromised due to a virus or other security related issue. Ensure you have a fully qualified domain name, apply for a complaint feedback loop, as well as scanning your systems and securing any compromises before opening a support request.
421 RLY:NW  Click for help & fix
The IP address you are sending from has been temporarily rate limited because the IP is new or has been idle for a long time. Please allow 24-48 hours and continue to send mail normally. It takes a little time to determine your IP's reputation.
421 RLY:SN  Click for help & fix
This error indicates you are sending email using a disallowed AOL.COM screenname as your FROM or REPLY-TO address, or as one of AOL's affiliates from an unauthorized IP address. Example: Billing@aol.com
452 Requested action not taken  Click for help & fix
This error indicates your mail server or ISP's mail server has insufficient disk space . Please contact your ISP or system administrator.
500 5.1.1 : Recipient address rejected: aol.com  Click for help & fix
Senders using scripts to remove unknown users automatically, should be looking for both the new error code and the old one.
500 Syntax error, command unrecognized  Click for help & fix
This may include errors such as command line too long, or if you are statically assigning one of our IPs. Please contact your ISP or system administrator to help resolve this issue.
550 "username" Is Not Accepting Mail From This Sender  Click for help & fix
This error indicates that the AOL Member has configured his account, possibly inadvertently, to only accept mail from certain addresses and/or domains on the Internet. The member will have to change their Mail Controls in order to receive mail from you. AOL Postmasters can not override these Member defined settings. We respect Member's privacy and their ability to control their own mail. AOL Postmasters cannot forward the mail for you. AOL members that have set this rule accidentally can view instructions on how to change the setting, or contact AOL Member Services.
550 Access denied  Click for help & fix
This error indicates that your site has been blocked from sending e-mail to AOL. Contact your e-mail administrator for assistance.
550 Mailbox not found  Click for help & fix
This error indicates that the AOL Member no longer exists on AOL or the address is misspelled.
550 Requested action not taken: DNS FAILURE  Click for help & fix
These errors indicate that there are DNS resolution problems somewhere between your domain and AOL. This usually means that AOL is unable to resolve your domain name in DNS before accepting that mail for delivery. Contact your e-mail administrator for assistance. The network administrator for the site may have to modify their DNS records.
550 Sender domain not found in DNS  Click for help & fix
These errors indicate that there are DNS resolution problems somewhere between your domain and AOL. This usually means that AOL is unable to resolve your domain name in DNS before accepting that mail for delivery.
550 Service unavailable or SMTP error from remote mailer after initial connection  Click for help & fix
The information presently available to AOL indicates this server is being used to transmit unsolicited e-mail to AOL. Based on AOL's Unsolicited Bulk E-mail policy, AOL cannot accept further e-mail transactions from this server or domain. Please have your ISP/ASP or server admin visit http://postmaster.info.aol.com for more information.
552 Mailbox full  Click for help & fix
This error indicates that the AOL Member's mailbox is full. The AOL member will need to free up additional space before they can receive email.
552 Message exceeds maximum fixed size  Click for help & fix
This indicates that the mail sent was larger than AOL currently allows. The largest piece of e-mail that an AOL member can accept from or sent to the Internet is 16 megabytes. This includes the message text, headers and the attachment combined. These sizes can not be changed.
554 CON:B1  Click for help & fix
The IP address has been blocked due to a spike in unfavorable e-mail statistics.
554 DNS:B1  Click for help & fix
The reverse DNS of your IP Address is typical of a dynamic/residential IP Address. Please have it updated to something unique like mail.example.com, or use the mail servers your ISP provides for residential customer traffic. If the rDNS has been updated and the problem persists, please open a support request.
  • 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 should be changed to reflect a fully-qualified domain name with standard reverse DNS.
554 DNS:B2  Click for help & fix
The reverse DNS of your IP Address is typical of a dynamic/residential IP Address and has generated AOL Member complaints. Please have it updated to something unique like mail.example.com, or use the mail servers your ISP provides for residential customer traffic. If the rDNS has been updated and the problem persists, please open a support request.
  • 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 should be changed to reflect a fully-qualified domain name with standard reverse DNS.
554 HVU:B1  Click for help & fix
There is at least one URL or domain in your e-mail that is generating substantial complaints from AOL members. Resolution will require opening a support request.
554 RLY:B1  Click for help & fix
This error message is a dynamic block on our system. Dynamic blocks are placed on an IP address when the IP's statistics break our threshold. These are automated blocks that are removed by the system within 24 hours once the complaints are again below the threshold.
554 RLY:B2  Click for help & fix
This error message indicates that a hard block has been placed against your IP address due to poor IP reputation. Resolution will require opening a support request once the IP reputation can be improved.
554 RLY:BD  Click for help & fix
This error message indicates that a hard block has been placed against your email because it has triggered too many anti-spam flags. This block is not against the IP. It targets specific types of email.
554 RLY:CH  Click for help & fix
A computer or computer(s) on your network may be compromised and is sending mail that matches the signature of known spam. Ensure you have a fully qualified domain name, apply for a complaint feedback loop, as well as scanning your systems and securing any compromises before opening a support request.
554 RLY:CS4  Click for help & fix
This error message indicates that your email has been identified as coming from a server or web site that may have a compromised script or program installed. Ensure you have a fully qualified domain name, apply for a complaint feedback loop, as well as scanning your systems and securing any compromises before opening a support request.
554 RLY:IR  Click for help & fix
The reverse DNS of your IP Address is typical of a dynamic/residential IP Address and has a high percentage of invalid recipient attempts. Ensure you have a fully qualified domain name, apply for a complaint feedback loop, as well as scanning your systems and securing any compromises before opening a support request.
554 RLY:SN  Click for help & fix
This error indicates you are sending email using a disallowed AOL.COM screenname as your FROM or REPLY-TO address, or as one of AOL's affiliates from an unauthorized IP address. Example: Billing@aol.com
554 RTR:BB  Click for help & fix
AOL works with many ISPs to maintain lists of dynamic and residential IP addresses. Per our E-mail Guidelines, we do not accept mail from these addresses. If you are blocked with RTR:BB and have a fully qualified domain name (FQDN), open a support request to lift an RTR:BB block. If you do not have a FQDN, please have your ISP create one for you and then open a support request.
554 RTR:BG  Click for help & fix
This error indicates you are sending email from an IP address not yet delegated or allocated. Talk to your ISP or hosting company about this problem before opening a support request.
554 RTR:BL  Click for help & fix
This error message indicates that a permanent block has been placed against your IP due to poor IP reputation. Apply for a complaint feedback loop before opening a support request.
554 RTR:CH  Click for help & fix
A computer or computer(s) on your network may be compromised and is sending mail that matches the signature of known spam. Ensure you have a fully qualified domain name, get approved for a complaint feedback loop, scan your system for compromises and secure any issues before opening a support request.
554 RTR:DU  Click for help & fix
AOL uses the Spamhaus PBL to block mail from dynamic and residential IP addresses. Per our E-mail Guidelines, we do not accept mail from such addresses. If you believe your IP is listed in error, please contact your ISP directly and have them update their listing with the PBL. If...
  • your ISP reports that the IP is correctly listed in the PBL, and that you should be able to send mail from it, or
  • you were recently assigned IPs, have changed the rDNS on them, and allowed 48-72 hours for propagation time...and you are still getting the error, please open a support request.
554 RTR:GE  Click for help & fix
This a transient error indicating a technical issue on AOL's side. Please wait 24 hours and re-try your mail.
554 RTR:RD  Click for help & fix
The reverse DNS of your IP Address is typical of a dynamic IP Address and/or has generated AOL Member complaints. Ensure you have a fully qualified domain name and get approved for a complaint feedback loop before opening a support request.
  • 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 should be changed to reflect a fully-qualified domain name with standard reverse DNS.
554 RTR:SC  Click for help & fix
This error message is indicative of a block due to successive dynamic blocks issued against your IP address. Get approved for a complaint feedback loop before opening a support request.