On 8/15/2013 2:30 AM, Grant wrote: >>>>> A few people have told me they received an email error message after >>>>> emailing me. I'm trying to get a copy of one of the error emails, >>>>> but I can't imagine what would cause that besides possibly my >>>>> greylisting. Has greylisting been known to lead to email error >>>>> messages being sent to senders in some instances? >>>> >>>> The sender may receive an error if their server has an unusual >>>> setup. Such servers must be whitelisted in your greylist software. >>> >>> The last sender who told me about the error message was on a >>> comcast.net address. >> >> Comcast (nor any major provider) should be greylisted. Any >> reasonable greylist software should have a setting to whitelist >> well-known mail servers. > > So I'm sure I understand, well-known mail servers should be whitelisted?
well-known mail servers should be whitelisted in greylist software. You can ignore this with postscreen and postfix 2.11+. >> Postfix 2.11 (currently in development snapshots) includes a >> wonderful feature to bypass postscreen tests for clients listed in >> dns whitelists, such as list.dnswl.org, greatly reducing unnecessary >> tests. > > I'm actually using postfix-2.11_pre20130710. Can you point me in the > right direction for setting up the DNS whitelist interaction? Should > that (for example) prevent comcast.net users from receiving 450 error > email notices? Excellent! Use a dns white list with a negative score in the postscreen_dnsbl_sites, and set a negative value for postscreen_dnsbl_whitelist_threshold. Simple example: # main.cf postscreen_dnsbl_sites = zen.spamhaus.org list.dnswl.org*-1 postscreen_dnsbl_whitelist_threshold = -1 See the RELEASE_NOTES and POSTSCREEN_README for details. -- Noel Jones
