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Ralf Hildebrandt put forth on 3/4/2010 1:55 AM:
> "The Spamhaus DBL is a realtime database of domains (typically web site
> domains) found in spam messages. Mail server software capable of
> scanning email message body contents for URIs can use the DBL to
> identify, classify or reject spam containing DBL-listed domains."
Two paragraphs later, on the same Spamhaus web page:
"The DBL is both a domain URI Blocklist and RHSBL. It is intended primarily
for message body URI checks but it can additionally be used for connection
checks at the SMTP level and header domain checks (HELO, connecting IP rDNS
domain, From & Reply-To domains, Message-ID domain) and other checks
So, can I use the following to reject connections whose A record is in the
Spamhaus DBL? Does this also query for the domain in the PTR/FQrDNS record?