[Mailman-Users] Bounce

[wilmalewis at comcast.net]

I have been using this program on my site for about 10 months now, without a problem.  Last month almost all e-mails started bouncing for no apparent reason.  I've told subscribers to put the address on their "safe" list, but it doesn't seem to do much good.  Does anybody else has this problem, and what can I do about it?  I've tried to reinstall, but that didn't work either.
Thanks,
Wilma