Hello We had complaints about delivery issues from hosting.com.
After looking at the logs, it's obvious what goes wrong: We use greylisting, combined with exceptions for whitelists like dnswl.org or dnswl.swinog.ch to fend of botnet spam and accept email without delay from known/trusted ranges. The hosting.com ipv4 ranges are not in the whitelists we use, so they hit the greylist. Our threshold to overcome the greylisting is 10minutes. If a hosting.com user is sending an email, our mailserver receives 2 to 4 connections within only a couple of minute and from different ip addresses (all within a /24, so that would work with our implementation). The problem is that all attempts are made before the 10min threshold would accept the email and whitelist the tripple. After those attempts, no more attempts are made, unless the same sender is sending the email to the same recipient again, after noticing the failure. Do others also observer this problem with hosting.com? Are there other DNS based ipv4 whitelists we could use as source for trusted email hosts? -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________ _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
