[메일] smtp relay code

This table lists some of the most common SMTP reply codes. In general,

response codes in the 100 to 300 range are considered successful; those in the

400 to 500 range are considered unsuccessful.

Table 2.1 SMTP Reply Codes

Code Text of Response

211

system status, or system help reply

214

help message

220

service ready

221

service closing transmission channel

250

request mail action okay, completed

251

user not local, will forward to

354

start mail input; and with .

421

servers not available, closing transmission channel

450

requested mail action not taken: mailbox unavailable

451

requested action aborted: local error in processing

452

requested action not taken: insufficient system storage

500

syntax error, command unrecognized

501

syntax error in parameters or arguments

502

command not implemented

503

bad sequence of commands

504

command parameter not implemented

550

requested action not taken: mailbox unavailable

551

user not local; please try

552

requested mail action aborted: exceeded storage allocation

553

requested action not taken: mailbox name not allowed

554

transaction failed

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