Solution 5 Confirm that the NDR is related to a message that you actually sent If your Sent folder contains only messages that you know you sent, then the NDR you received could be a result of backscatter (a useless NDR about a message you didn't send), and you can ignore it550 511 Recipient address rejected User unknown in virtual alias tablePrev next (a) Not later than 30 days after the date of the enactment of this section, the Office of Personnel Management shall prescribe regulations providing for work schedules under which an employee whose personal religious beliefs require the
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