failed to add recipient

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    SMTP Error (550): Failed to add recipient

    SMTP Error (550): Failed to add recipient "xxx@gmail.com" (Verification failed for <xxx@xyz.net> The mail server could not deliver mail to xxx@xyz.net. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.Sender verify failed). You have to check the MX...
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