Comments on: Greylisting and GMAIL

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By: @amartinezi

@amartinezi — Tue, 28 Jun 2011 23:51:40 +0000

I have same issue..long delay due to several smtp conectionc with diferent ip

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By: Geoff Winkless

Geoff Winkless — Wed, 30 Dec 2009 14:12:57 +0000

The correct solution is to modify the greylisting so that SMTP servers from the same root domain are treated as equivalent for the greylisting rules. Any other modification is just a nasty hack.

By: TerminalDigit

TerminalDigit — Mon, 01 Dec 2008 13:05:31 +0000

Haven’t used Postgrey myself, but it doesn’t look like stripping the last byte would work here (Google has way more than 256 IPs). In the example given, the first IP is 66.249.82.232, so Postgrey should permit follow-ups from 66.249.82.xxx. But Google retries from 64.233.178.250, 209.85.200.174, 64.233.170.187, and finally 209.85.200.171. Even if the last byte were dropped from consideration, there still wouldn’t be a match until the last communication. Again, I haven’t used postgrey, so do let me know if I’m misinterpreting this.

Also interesting to note that the same hostname “wf-out-1314.google.com” appears to be mapping to both 209.85.200.171 and 209.85.200.174.

By: Jonathan Krengel

Jonathan Krengel — Mon, 29 Sep 2008 17:57:00 +0000

Looks like you are just missing a feature on your greylisting solution.

Postgrey according to thier description shouldn’t have this issue.
“Lookup by subnet
Addresses are normally stripped of their last byte, so that mail servers with multiple addresses are recognized as only one.”