listserver problems

I've just had a warning from the SuSE ezmlm that my account has been bouncing emails, and this seems to be a problem with using the osirusoft blacklist. However, as far as I know, I'm not using any blacklist at all. How do I find out whether (presumably spamassassin) is using this blacklist? Oddly, only some email msgs have been bouncing, which suggests that perhaps the problem isn't with me? John -- John Pettigrew Headstrong Games john@headstrong-games.co.uk Fun : Strategy : Price http://www.headstrong-games.co.uk/ Board games that won't break the bank