c# - Sending Email from my application cause an exception -

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i have application send email issues. use smtpclient class work. works fine 1 of mail servers use exchange server sending mail. sendemail method throw exception message:

550 requested action not taken: mailbox unavailable / 5.7.1 unable relay

is problem application or mail server configuration? solution?

well smtp error 550 generically (based on little searching) define like:

550 requested actions not taken mail box unavailable.

this error @ destination. eg. disk drive has filled up.

in case:

550 requested action not taken: mailbox unavailable / 5.7.1 unable relay

the suffix indicates:

  1. the email not hosted on smtp server you're communicating with.
  2. that smtp server refusing forward final destination (or relay).

there many possible reasons #2 (eg. isp's smtp server relay when sending inside isp's network) finding out need specifics (and temporary situation loss of connectivity). best talk administrator/support server.


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