bug 3893: ArchiveIterator, when run with opt_n, would report the message number as the receive_date.  to fix this, we can allow receive_date to be determined at run time, then propagate the value back up the chain.
bug 3893: ArchiveIterator, when run with opt_n, would report the message number as the receive_date.  to fix this, we can allow receive_date to be determined at run time, then propagate the value back up the chain.

git-svn-id: e9fe9b84e32fc5e57b7d09c40cd78b14ea28ed71@54644 13f79535-47bb-0310-9956-ffa450edef68

apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin