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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.
One of the top reasons a user can't find their emails is due to settings from a third-party email client such as Outlook or the Mail app on your phone. Chances are the settings in the program are set to delete the emails from the AOL server each time you check your mail.
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.
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.
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]
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.
Requested action not taken. File unavailable (e.g., file not found, no access). 551: Requested action aborted. Page type unknown. 552: Requested file action aborted. Exceeded storage allocation (for current directory or dataset). 553: Requested action not taken. File name not allowed. 600 Series: Replies regarding confidentiality and integrity: 631