[NLRS] email to arrl.net addys treated as spam -- why?

[Todd Sprinkmann]

   Hello,

   This list seems like the place to ask this question, so here 
goes:

   I try to send out email touting the SSB nets on 2 meters to
about 35-40 hams in W ILL, IA and S MN that are in my
contest logs over time.  I figure most of them are not subbed
to either the NLRS, BC or SMC reflectors, so they don't
know there's a net and someone is looking their way.

   I enter their collective addys into a group, and then send out
the email to the whole group.

   On the first try, 12 bounced back.  All 12 had ARRL.net addys
and the reason for the bounce said "This message scored 7.4
spam points."  Looked thru my group of 35, and sure enough,
there's 12 recipients with ARRL email.  So each and every one
bounced back to me.  The other 25 or so (which are not ARRL
email addresses) went through just fine.

    Tried a few more times, sending to just the 12 ARRL addys.
Nope, they all bounced.  Tried sending in groups of 5, nope.
Finally I just tried sending to 2 at a time.  Still comes back -- 
same message, "This message scored 7.4 spam points."

    Anyone care to edumacate me?  Am I just out of luck with
trying to send any email to someone with an arrl.net address?

    There must be something I'm missing.  Surely ARRL doesn't
want to be set this tight?

    Thanks in advance for any help,
    73,
    Todd  KC9BQA