On Aug 4, 2005, at 05:24, Wilfried Mestdagh wrote:
> Hello,
>
> Busy with TSmtpCli will used on a local network only. I'm looking at
> the
> reply codes the SMTP server can give.
>
> Im I right that:
> the 400 range can be interpreted as 'try again later'
> the 500 range as 'this is no good, dont do this again'
Yes.
300+ - Warnings: The sender should decide if it wants to continue.
("Should I continue?")
400+ - Transient error: The error condition is temporary. ("Try again
later.")
500+ - Terminal error: The error condition is permanent. ("Go away!!")
Here's the explanation of the first digit of the codes from the RFC-821
(APPENDIX E):
There are five values for the first digit of the reply code:
1yz Positive Preliminary reply
The command has been accepted, but the requested action
is being held in abeyance, pending confirmation of the
information in this reply. The sender-SMTP should send
another command specifying whether to continue or abort
the action.
2yz Positive Completion reply
The requested action has been successfully completed. A
new request may be initiated.
3yz Positive Intermediate reply
The command has been accepted, but the requested action
is being held in abeyance, pending receipt of further
information. The sender-SMTP should send another command
specifying this information. This reply is used in
command sequence groups.
4yz Transient Negative Completion reply
The command was not accepted and the requested action did
not occur. However, the error condition is temporary and
the action may be requested again. The sender should
return to the beginning of the command sequence (if any).
It is difficult to assign a meaning to "transient" when
two different sites (receiver- and sender- SMTPs) must
agree on the interpretation. Each reply in this category
might have a different time value, but the sender-SMTP is
encouraged to try again. A rule of thumb to determine if
a reply fits into the 4yz or the 5yz category (see below)
is that replies are 4yz if they can be repeated without
any change in command form or in properties of the sender
or receiver. (E.g., the command is repeated identically
and the receiver does not put up a new implementation.)
5yz Permanent Negative Completion reply
The command was not accepted and the requested action did
not occur. The sender-SMTP is discouraged from repeating
the exact request (in the same sequence). Even some
"permanent" error conditions can be corrected, so the
human user may want to direct the sender-SMTP to
reinitiate the command sequence by direct action at some
point in the future (e.g., after the spelling has been
changed, or the user has altered the account status).
>
> --
> Rgds, Wilfried
> http://www.mestdagh.biz
>
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