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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]
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.
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.
Most email software and applications have an account settings menu where you'll need to update the mail server settings. When entering your account info, make sure you use your full email address, including @netscape.com, and that the SSL encryption is enabled for incoming and outgoing mail.
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.)
This is a list of abbreviations which are less commonly used in the subject of an English email header: AEAP, meaning As Early As Possible. ASAP, meaning As Soon As Possible. AB, meaning Action By. Used with a time indicator to inform the recipient that the sender needs a task to be completed within a certain deadline, e.g. AB+2 meaning Action ...