[Mailman-Users] Odd code when receive mail via mailman

I have a mailman list that is set to be a one way announcement list. I have had complaints from some people that they get this weird coded stuff when they get a message that looks something like this (I am making the actual numbers up)

03 42 32 20 53 A0 D0 23 23 50 D0 20 S0 "the body of the text D9 39 20 D2 19 10 12 22 39 30 40 29 19 is written oddly over here"

Has anyone ever seen that. When I send the same person who is getting this odd code via the mailing list a test message directly from my own email it comes through just fine. It seems to only happen via the list, and not to all people.

Thanks.

April