常见邮件错误代码
 

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 (see section 4.2.4)

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 <domain> Service ready

221 <domain> Service closing transmission channel

421 <domain> 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 <forward-path>

(See section 3.4)

252 Cannot VRFY user, but will accept message and attempt

delivery

(See section 3.5.3)

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, or command rejected

for policy reasons)

451 Requested action aborted: error in processing

551 User not local; please try <forward-path>

(See section 3.4)

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 <CRLF>.<CRLF>

554 Transaction failed (Or, in the case of a connection-opening

response, "No SMTP service here")

4.2.3 Reply Codes in Numeric Order

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 <domain> Service ready

221 <domain> Service closing transmission channel

250 Requested mail action okay, completed

251 User not local; will forward to <forward-path>

(See section 3.4)

252 Cannot VRFY user, but will accept message and attempt

delivery

(See section 3.5.3)

354 Start mail input; end with <CRLF>.<CRLF>

421 <domain> Service not available, closing transmission channel

(This may be a reply to any command if the service knows it

must shut down)

450 Requested mail action not taken: mailbox unavailable

(e.g., mailbox busy)

451 Requested action aborted: local error in processing

452 Requested action not taken: insufficient system storage

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 (see section 4.2.4)

503 Bad sequence of commands

504 Command parameter not implemented

550 Requested action not taken: mailbox unavailable

(e.g., mailbox not found, no access, or command rejected

for policy reasons)

551 User not local; please try <forward-path>

(See section 3.4)

552 Requested mail action aborted: exceeded storage allocation

553 Requested action not taken: mailbox name not allowed

(e.g., mailbox syntax incorrect)

554 Transaction failed (Or, in the case of a connection-opening

response, "No SMTP service here")