Am 18.04.2012 14:13, schrieb Charles Marcus: > On 2012-04-17 6:54 AM, Reindl Harald <h.rei...@thelounge.net> wrote: >> the hard facts are that EVERY site using a dedicated >> spamfilter (own appliance or external service) have >> different IP's for MX and outgoing mail > > Not if they are using said spamfilter service for relaying their outbound > mail > *and* if the spamfilter service uses the same IP blocks for relaying.
"IP blocks" does not matter and if you whitelist BLOCKS you are making a major mistake - there are way to much single addresses with static IP and a mailserver where the other IPs in the address-block are totally different customers of the ISP owning the netblock so you should only whitelist single addresses a spamfilter usually does not relay if you have a managed network outgoing mails are usually not spam so the spamfilter-appliance is a dedicated IP and receives incoming mail from the internet, realy it after scan to the mailserver and the mailserver itself relays directly
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