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A. It depends on where the filtering is taking place. If they are being black holed by one of the black hole sites (the returned mail will contain a line stating "rejected by black hole site 'sitename'"), the sender will want to have their mail server admin contact the black hole site listed for removal instructions. Usually this involves patching their mail server and then allowing the black hole site to try exploiting the mail server. Once this is done, the server will no longer be filtered and all email from that server will be receivable by us and any other services subscribed to that black hole site. If there is no black hole site referenced in the returned email, then it is probably our own personal list of blocked sites. If this is the case, we would need to be pointed to an aup, evidence spammers get cancelled, or a long absence of spam from the senders domain and we could remove them from our list.