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Blacklisted
A message sent to me never appeared in my mailbox but was labeled "blacklisted by user" I cannot find a way to undo this !
550: 5.7.1 [PF] Mail rejected by policy. (Blacklisted by user)
A message sent to me never appeared in my mailbox but was labeled "blacklisted by user" I cannot find a way to undo this !
550: 5.7.1 [PF] Mail rejected by policy. (Blacklisted by user)
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A little research indicates that it is probably outisde your direct control and not related to Thunderbird. Is your account an institutional Microsoft account?