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 > > -- > To unsubscribe or change your settings for TWSocket mailing list > please goto http://www.elists.org/mailman/listinfo/twsocket > Visit our website at http://www.overbyte.be > -- To unsubscribe or change your settings for TWSocket mailing list please goto http://www.elists.org/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be