DL205 User Manual, 4th Edition, Rev. D
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Chapter 5: Standard RLL Instructions
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SMTP Protocol Errors - SMTP (100-999)
Error Description
534 Authentication mechanism is too weak.
538 Encryption required for requested authentication mechanism.
550 Requested action not taken; mailbox unavailable.
551 User not local; please try <forward path>
552 Requested mail action aborted; exceeded storage allocation
553 Requested action not taken; mailbox name not allowed.
554 Transaction failed