SMTP Commands Part # 3 - List of Server reply codes - Le Café Central de DeVa - Site Home

When we execute the SMTP command, we'll receive a reply from the mail server in the form of a three digit number followed by information describing the reply.

For example,

250 OK

Please find the list of reply codes from the Server.

211	A system status or help reply.
214	Help Message.
220	The server is ready.
221	The server is ending the conversation.
250	The requested action was completed.
251	The specified user is not local, but the server will forward the mail message.
354	This is a reply to the DATA command. After getting this, start sending the body of the mail message, ending with "\r\n.\r\n."
421	The mail server will be shut down. Save the mail message and try again later.
450	The mailbox that you are trying to reach is busy. Wait a little while and try again.
451	The requested action was not done. Some error occurs in the mail server.
452	The requested action was not done. The mail server ran out of system storage.
500	The last command contained a syntax error or the command line was too long.
501	The parameters or arguments in the last command contained a syntax error.
502	The mail server has not implemented the last command.
503	The last command was sent out of sequence. For example, you might have sent DATA before sending RECV.
504	One of the parameters of the last command has not been implemented by the server.
550	The mailbox that you are trying to reach can't be found or you don't have access rights.
551	The specified user is not local; part of the text of the message will contain a forwarding address.
552	The mailbox that you are trying to reach has run out of space. Store the message and try again tomorrow or in a few days-after the user gets a chance to delete some messages.
553	The mail address that you specified was not syntactically correct.
554	The mail transaction has failed for unknown causes.