You ask each dnsbl for client IP, now you will ask them for each A or MX
record. That means, number of DNSBL lookups will increase ad least two times
(for each dnsbl you already query).
On 03.08.17 17:04, Martin Jiřička wrote:
Hmm, I am not server administrator by profession, so maybe I do not
understand it enough, but I would only add one more restriction on
domain in MAIL FROM header, that would make one DNS lookup (getting IP
for the domain) and one DNSBL lookup (checking that IP in Spamhaus).
That are two lookups, aren't they? It is true that it is not clear
whether to get A or MX records for the domain. For my example the
blacklisted IP address is within A record. I guess there is usually
only one A record for each domain?
What I was trying to say is that (if there was 1 A record per domain), the
number of spamhaus lookups would increase two times.
If you check MX records, number of lookups can increase even more.
Note that some dnsbls require (payed) subscription if you use them too much.
This is my first mail server so I need to check which restrictions
work best. Then I will optimize number and order of restrictions.
hopefully you find it out before get blocked by spamhaus :-)
as Allen recommended, it's goot to have local whitelist for any kinds of
DNSBL lookups.
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Christian Science Programming: "Let God Debug It!".
