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| Check out RFC 2821 you are supposed to use the codes defined in RFC 3463 (or 1893) ---------------------- In general, you have to look at your options and choose the one that most closely approximates what you are trying to communicate. In the set of 4xx messages you have: 421 Service not available 432 Password required 450 Mailbox unavailable/busy 451 Local error in processing 452 Insufficient storage 453 You have no mail 454 TLS not available temporarily 458 Unable to queue message temporarily 459 Node X not allowed Of all of those, 452 jumps out as the only one that obviously has something to do with storage limits. In attempting to communicate more accurately the cause of the error to the user, you are supposed to use the codes defined in RFC 3463 (or 1893); in this case, 4.2.2 (or 5.2.2, though the RFC says that it *should* be considered a "persistent transient error") communicates "mailbox full". Of the 5xx errors defined in SMTP, there are: 500 Syntax error 501 Syntax error in parameters 502 Command not implemented 503 Bad sequence 504 Parameter not implemented 521 Machine does not accept mail 530 Authentication required 534 Authentication mechanism too weak 538 Encryption required 550 Mailbox unavailable permanently 551 User not local 552 Message too big 553 Mailbox name not allowed 554 Transaction failed |
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