Airport Support Groups - Group Email?

A year ago I started an airport support group called "Friends of Iowa
City Airport" to help save our threatened airport. It has now grown
to over 170 members, and sending memos, updates and emails to such a
large group has become unwieldy.

For a variety of reasons I would like to stick with a web-based
(rather than Outlook or Outlook Express email) solution. I have looked
at using Yahoo Groups, but have rejected them as being overly
complicated to "join." (Many of our members are getting up there in
years, and even basic email can be a challenge for them, let alone
trying to figure out how to "join" a Yahoo group.)

I am looking for a way to send "group" email updates to large numbers
of members. Unfortunately, my ISP's (Mediacom) group email software
is so laced with anti-Spam measures that it is essentially useless to
me. (The killer: It limits the number in a group to 25 or less, etc.)

What say the group? Anyone got any recommendations? Is there a group
email site on the web that is flexible and powerful enough for what I
need?

Thanks!
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"