DNSBL

[mkobald]

Does the email receiving open relay detection work with the dns block list zen.spamhaus.org? If not, are there any other good ones I can use?

[labull]

Though I haven't used it recently I have used the SBL at spamhaus in the past. Since that is now part of Zen I should think it would work.

As a warning - do NOT use ordb.org. Reports are that it replies to all queries with a "don't accept" so all email will be blocked.

Check www.dnsbl.com for a list of sites and reviews.