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550 RCPT address has non-existant domain

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  • 550 RCPT address has non-existant domain

    I don't understand why, but one our customer from a couple of days receives this NDR when He try to send an email to one user of our domain (not always the same)

    <qi-srv-06.qiwood.it #5.5.0 smtp;550 RCPT address has non-existant domain <giben.it>>
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