Israel P wrote on 30 jun 2006 in soc.genealogy.jewish:

Does anyone know if the American internet provider comcast has something
that blocks genealogy-related email? (Or mail >from Israel, perhaps?)

I have been getting blacklist announcements >from them the last few days
for mail to two very regular correspondents and when I contact their
blacklist site, it does no good.

Perhaps your domain name does not pass their decency filter?

Evertjan Hannivoort.
The Netherlands.
(Please change the x'es to dots in my emailaddress)