[G4] Fix for Image Spam?

[Melissa Crowe]

Hello,
I am having trouble posting to the list. I get this error:

>Failed to deliver to 'G4 at lists.themacintoshguy.com'
>LIST module(list G4 at lists.themacintoshguy.com) reports:
>  Your message cannot be posted.
>  It has the content-type: multipart/alternative,
>  and this list accepts text only

I am using Eudora 6.1 under Panther 10.3.3 What can I do to avoid this error?
Thanks,
Melissa