常见群发失败的返回码（错误代码）解析

500 Syntax error, command unrecognized

[This may include errors such as command line too long]

501 Syntax error in parameters or arguments

502 Command not implemented

503 Bad sequence of commands

504 Command parameter not implemented

211 System status, or system help reply

214 Help message

[Information on how to use the receiver or the meaning of a

particular non-standard command; this reply is useful only to the human user]

220 Service ready

221 Service closing transmission channel

421 Service not available, closing transmission channel

[This may be a reply to any command if the service knows it must shut down]

250 Requested mail action okay, completed

251 User not local; will forward to

450 Requested mail action not taken: mailbox unavailable

[E.g., mailbox busy]

550 Requested action not taken: mailbox unavailable

[E.g., mailbox not found, no access]

451 Requested action aborted: error in processing

551 User not local; please try

452 Requested action not taken: insufficient system storage

552 Requested mail action aborted: exceeded storage allocation

553 Requested action not taken: mailbox name not allowed

[E.g., mailbox syntax incorrect]

354 Start mail input; end with .

554 Transaction failed  

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