What are the common SMTP response codes?
If at any stage in an SMTP transaction there is an error, it will have a unique code assigned to it so the user can hopefully determine why it has happened.
However the response codes are not always errors,
SMTP will also output a success code.
The first digit of the response denotes whether it is good, incomplete or simply bad.
2 – Success reported
4 – Temporary failure
5 – Permanent failure
Here are a list of known codes:
|211||System status or system help reply|
|250||Requested mail action okay, completed|
|283||The Gordano server is configured so that messages aren’t being saved. The FROM and TO address are taken from the e-mail message headers|
Start mail input; end with
|450||Requested action not taken; mailbox unavilable or busy|
|451||Requested action aborted, local error in processing|
|452||Requested action not taken, insufficient system storage|
|500||Syntax error, command unrecognized. Also command line too long|
|501||Syntax error in paramaters or arguements|
|502||Command not implemented|
|503||Bad sequence of commands|
|504||Command parameters not implemented|
|550||Action not taken. Mailbox unavailable. Not found, not accessible|
User not local, please try
|552||Exceeded storage allocation|
|553||Mailbox name not allowed. Mailbox syntax may be incorrect|
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- What is the SMTP RCPT clause?
- What is the SMTP DATA clause?
- What is the SMTP HELO/EHLO clause?
- What is SMTP Response Code Theory?
Keywords:SMTP response code theory error