Im having some trouble sending emails to some specific addresses... its not a general thing and I cant seem to find a trend to the emails that bounce back.

Im now thinking that perhaps my domain name is listed as a SPAM generator on some black list. Is there a place on the web where I can try to verify this? Are databases posted somewhere?

I wonder if these are done by country, or if there is one general place where they are concentrated, as my domain name is registered here in Argentina?

Thanks.