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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.
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.
Modern greylisting applications (such as Postgrey for Unix-like operating systems) automatically whitelist senders that prove themselves capable of recovering from temporary errors, [6] regardless of the reputed spamminess of the sender. [citation needed] Implementation also generally include the ability to manually whitelist some mailservers.
If you've started to receive an endless flow of junk email, you may be the victim of spam bombing. This is a tactic used by bad actors and hackers to distract you from seeing emails that really are important to you.
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Learn about possible workarounds for Temporary Error 11 in AOL Mail.
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