yahoo things my domain is a spammer

[bob at sinister.com (Bob Keyes)]

I have been made aware that Yahoo thinks my domain sinister.com is a spam
source. Users tell me things end up in the 'bulk mail' folder, so they
can't send to yahoogroups.

We don't do spam here

I went and searched usenet for my domain, and it seems as though late last
month and early this month someone was sending spam with a fake
sinister.com address in it. I wonder if this set off the spam filter?

If anyone knows how to check various spam registries, or knows who to
contact at yahoo, please tell me.