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The server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API). 502 Bad Gateway The server was acting as a gateway or proxy and received an invalid response from the upstream server. 503 Service Unavailable
503 Service Unavailable The server is undergoing maintenance or is temporarily overloaded and so cannot process the request. A "Retry-After" header field may specify when the client may reattempt its request. [1]: §21.5.4 504 Server Time-out
421 Service not available, closing transmission channel (This may be a reply to any command if the service knows it must shut down) 432 4.7.12 A password transition is needed [ 3 ] 450 Requested mail action not taken: mailbox unavailable (e.g., mailbox busy or temporarily blocked for policy reasons)
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.
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Sometimes the old "turn it off and on again" actually works! Restarting your web browser or computer will clear our the internal cache or memory and will often fix most random computer problems.
503 may refer to: 503 (number) 503, a year; 503, a track by Hans Zimmer on the Angels & Demons soundtrack; 503 Service Unavailable, an HTTP status code; Area code 503, a North American telephone area code in northwestern Oregon; BMW 503, a grand tourer; Fiat 503, a small family car; Country code +503, for El Salvador