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The Basic Status Codes have been in SMTP from the beginning, with RFC 821 in 1982, but were extended rather extensively, and haphazardly so that by 2003 RFC 3463 rather grumpily noted that: "SMTP suffers some scars from history, most notably the unfortunate damage to the reply code extension mechanism by uncontrolled use.
The number 451 is a reference to Ray Bradbury's 1953 dystopian novel Fahrenheit 451, in which books are outlawed. [2] 451 provides more information than HTTP 403, which is often used for the same purpose. [3] This status code is currently a proposed standard in RFC 7725, which updated the IANA HTTP Status Codes Registry to include 451. [4]
To restore your ability to email AOL members, ask the administrator of your email domain to submit a request to the AOL Postmaster support team. The process to review these requests can take anywhere from a few hours to a few weeks to complete.
This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.
When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you.
If your third-party email app is having issues connecting, sending, or receiving emails, you may need to reconfigure your account or update the app. Use these steps to identify and fix the source of the problem.
The requested action is being initiated; expect another reply before proceeding with a new command. (The user-process sending another command before the completion reply would be in violation of protocol; but server-FTP processes should queue any commands that arrive while a preceding command is in progress.)
Greylisting is a method of defending e-mail users against spam.A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize.