In some embodiments, a whitelist such as a whitelist used to hold specific mailing list features, a whitelist used to hold {HEAD ~ sender/recipient addresses}, or a whitelist used to hold sender addresses, may contain {TAIL ~ hashes} of content 
In some embodiments , a whitelist such as a whitelist used to hold specific mailing list features , a whitelist used to hold { HEAD ~ sender / recipient addresses } , or a whitelist used to hold sender addresses , may contain { TAIL ~ hashes } of content
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH