>>>> 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? >> It turns out I'm using postscreen with deep protocol checks: > > Postscreen will defer one mail once every 30 days per unique client IP. > > If that's not acceptable, turn off postscreen deep protocol checks > or whitelist known good servers (from domain SPF records?) in the > postscreen access list. The deep protocol checks have eliminated most of the spam from my inbox so I'd like to keep them in place. > 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? - Grant
