Tuesday, February 3, 2004 you wrote:
CF> This is not good since many domains don't allways have complete A
CF> or = cname records for all of they sending computers (mta ou mua)
CF> ... Remember many legitimate mail can come indirectly from
CF> firewalls and = proxies shared by customers at isp level, and the
CF> isp don't allways add a = record for each domain handled by the
CF> firewall ... so you test will fail !!
Yes, I agree with Gustavo. There are many reasons why mail would
come from an ip with no A record: proxies, firewalls, gateways,
and probably others.
There are also reasons why a server would not have an mx record.
For one thing it might not be a mail server in the case of
firewalls and proxies. For another there is good reason to not
list a sending only smtp server as an MX if you do not want
incoming mail or if there are no mail boxes.
Terry Fritts
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