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	May 19, 2012

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SMTP Error Codes
Posted by SteveT on Sunday, January 20, 2008 :: Last Updated on Sunday, January 27, 2008:: Views 1902

Error #	Error Message (may vary)
421	Service not available, closing transmission channel
450	Mailbox unavailable
451	Local error in processing
452	Insufficient system storage
500	Syntax error, command unrecognized
501	Syntax error in parameters or arguments
502	Command not implemented
503	Bad sequence of commands
504	Command parameter not implemented
550	Requested action not taken: mailbox unavailable (or Relaying Denied)
551	User not local
552	Requested mail action aborted: exceeded storage allocation
553	Requested action not taken: mailbox name not allowed
554	Transaction failed
9100	Not enough memory
9101	A task is already in progress
9102	No recipient was specified
9103	Aborted by user
9104	Invalid email address
9105	Invalid mail server address
9106	Invalid user name
9107	Invalid password
9108	Mail server is not responding
9109	Invalid reply from the server
9111	One or more e – mails were undeliverable

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11/6/2011 1:10:34 PM

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Optimized SEARCH and STATUS IMAP commands. They appear to be used very extensively by Android, and (not that extensively, but still) by iPhone. Now users who use mobile phones to access their IMAP accounts will see considerable improvement;
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5/23/2011 5:53:55 PM

The server no longer requires Microsoft SQL Server. If SQL server is not found, it will use SQLite engine, which does not require separate installation. If SQL server is found, then user will be prompted whether he wants to use it;
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