Can some one explain about this ?(Delivery Failure Report : 550)

45 pts.
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Delivery Failure Report : 550
Email
SMTP
I have one case that one user in my company reply one email to her vendor(other company) but my system send Delivery Failure Report to her with reason 550. I try from help and think it mean this is no such user and no mail is sending, but today her vender reply that email to her. Is this bug of domino ? Very Thx for your help. Best Regard.

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Mail error 550 is a relaying denied error message. This is a configuration problem with the SMTP server which your mail system is trying to use to email the vendor.

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