SMTP Error Codes

0x800CCC60 - SMTP_RESPONSE_ERROR Invalid response.
0×800CCC61 - SMTP_UNKNOWN_RESPONSE_CODE Unknown error code.
0×800CCC62 - SMTP_500_SYNTAX_ERROR Syntax error returned.
0×800CCC63 - SMTP_501_PARAM_SYNTAX Parameter syntax incorrect.
0×800CCC64 - SMTP_502_COMMAND_NOTIMPL Command not implemented.
0×800CCC65 - SMTP_503_COMMAND_SEQ Improper command sequence.
0×800CCC66 - SMTP_504_COMMAND_PARAM_NOTIMPL Command not implemented.
0×800CCC67 - SMTP_421_NOT_AVAILABLE Command not available.
0×800CCC68 - SMTP_450_MAILBOX_BUSY Mailbox is locked and busy.
0×800CCC69 - SMTP_550_MAILBOX_NOT_FOUND Mailbox not found.
0×800CCC6A - SMTP_451_ERROR_PROCESSING Error processing request.
0×800CCC6B - SMTP_551_USER_NOT_LOCAL User mailbox is known, but mailbox not on this server.
0×800CCC6C - SMTP_452_NO_SYS