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This is useful for contracts , but for confidential messages senders may not want recipients to be able to prove to anyone what they wrote . The 16-bit type field will have a new EtherType to indicate the PDU is header-compressed with an algorithm that both sender and received agreed on . On the whole , we believe this method ( always name both sender and recipient ) is the best solution for electronic editions . What has n't happened is for a large number of people to implement a standard approach for sending that final response message to the sender - but there are lots of ways to do that ( take a look at the REST discussion groups ) . Not only does this program save the sender paper and postage costs , but it also keeps junk mail out of the Lab 's sanitary waste stream . You should routinely scan your spam mailbox ( the subject and sender at least - you do n't actually have to open the messages ) , especially when you first start filtering , to look for false positives . If both recipient and sender use the same native sampling resolution it may be more efficient and less error prone if both systems exchange images at their native sampling resolution rather than using the default rate specified in the standard . Heavy users will move to whitelists plus challenge mechanisms that require unfamiliar senders to go through an extra step to show they are n't spammers . Our technique exploits the fact that both sender and emitter can estimate channel occupancy by monitoring their vicinity . It is difficult to assign a meaning to " transient " when two different sites ( receiver - and sender - MTPs ) must agree on the interpretation . GMS now supports Sender Policy Framework ( SPF ) records , which is a widely recognized antispam and sender mechanism for SMTP transmission . HTTP does not give senders much support for mandatory extensions . Sender starts transfer by reading the file into multiple memory buffers . I examined the envelope 's return address and sender . If a sender does not provide packet predictability information it MUST set all PQs to 0 . Moreover , that the neurons are more than conduits through which signals travel from sender to receiver : they are themselves senders and receivers . Conventional cryptography typically requires a key - - a string of numbers - - shared by both sender and recipient . On going to their sent items folder , neither sender showed the attachments with the message to me , and could not find any other indication ( other than my contacting them about the attachments ) that the attachments had been sent to anyone but their intended recipients . Rep. Wilson 's ( at right ) bill requires senders of commercial e-mail to provide a valid return e-mail address , and a valid street address , and provide recipients an opt out opportunity .