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Hi All, I've always run with BOFHCHECKDNS successfully, but after recently upgrading my debian packages form courier 0.61 to courier 0.63, courier suddenly started rejecting all domains for both inbound and outbound mail. A small sampling: Jan 25 07:58:25 aloha courieresmtp: id=00000000032E4D3E.000000004B5D8509.00000D76,from=<logcheck@manawiz.com>,addr=<[email protected]>: DNS lookup failed. Jan 25 09:20:06 aloha courieresmtp: id=00000000031FC00E.000000004B5DEDBA.000064D0,from=<suga@wisdombell.com>,addr=<[email protected]>: DNS lookup failed. Jan 24 18:27:41 aloha courieresmtpd: error,relay=::ffff:209.85.210.189,from=<[email protected]>: 417 DNS lookup failure: gmail.com. Try again later Jan 24 18:28:02 aloha courieresmtpd: error,relay=::ffff:209.85.222.148,from=<3wr1dswaaeyclyo2zto-mprtyyp23rzzrwpr2z503....@groups.bounces.google.com>: 417 DNS lookup failure: groups.bounces.google.com. Try again later. Jan 24 18:49:08 aloha courieresmtpd: error,relay=::ffff:64.79.150.121,from=<[email protected]>: 417 DNS lookup failure: netbeans.org. Try again later. Setting BOFHCHECKDNS=0 of course resolves this, but also lets in more spam, so I'd like to find a way to fix the problem. DNS is configured and working fine on the server, e.g.: aloha:/etc/courier# dig +short MX gmail.com 30 alt3.gmail-smtp-in.l.google.com. 40 alt4.gmail-smtp-in.l.google.com. 5 gmail-smtp-in.l.google.com. 10 alt1.gmail-smtp-in.l.google.com. 20 alt2.gmail-smtp-in.l.google.com. aloha:/etc/courier# dig +short A alt3.gmail-smtp-in.l.google.com 209.85.218.11 aloha:/etc/courier# dig +short MX groups.bounces.google.com 5 gmr-smtp-in.l.google.com. 10 alt1.gmr-smtp-in.l.google.com. 10 alt2.gmr-smtp-in.l.google.com. aloha:/etc/courier# dig +short A gmr-smtp-in.l.google.com 209.85.221.205 aloha:/etc/courier# dig +short MX manawiz.com 0 manawiz.com. aloha:/etc/courier# dig +short A manawiz.com 64.34.170.220 aloha:/etc/courier# What could cause this? I've search for prior instances of BOFHCHECKDNS issues and haven't seen anything like this. Nor have I seen a clear explanation of how courier checks DNS or exactly what it checks. That would be illuminating. Thanks for any help, Chuck |
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