Hi Jack, 1. Since two different protocols , and possibly two different servers , are used to send and receive mail, it is possible that mail clients can perform one task and not the other. (Is the subject for 'are' 'protocols' only?
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Mister MicawberThe are grammatically agrees with protocols. I believe that the Columbia Guide to Standard AmE addresses this problem as a problem of the 'near-compound' subject, because (to me) the commas, creating 'non-restrictive' content, are quite similar to m-dashes in their intent:
'In compound like constructions with with, t