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exchange 2010 5.7.3 authentication unsuccessful

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hello everybody,

our customer has a web server hosted outside our organization and on-promise exchange 2010 server,

they have a "donation" website, any external user can receive a bank account number in his email by typing his email and then " submit.

but they receive this error message 

An error has occured while sending the email:
535 5.7.3 Authentication unsuccessful"

how to deal with this issue? please help


Mohammad Naji senior exchange administartor


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