|Vasiliy Kotikov||Mar 10, 2009 2:51 am|
|Marcus Ilgner||Mar 10, 2009 4:36 am|
|sergio||Mar 10, 2009 5:37 am|
|Marcus Ilgner||Mar 10, 2009 6:36 am|
|LuKreme||Mar 10, 2009 12:11 pm|
|Alessandro Vesely||Mar 11, 2009 2:04 am|
|Tim Lyth||Mar 11, 2009 4:12 am|
|LuKreme||Mar 11, 2009 6:45 am|
|cour...@thefreecat.org||Mar 11, 2009 7:12 am|
|LuKreme||Mar 11, 2009 2:06 pm|
|Subject:||Re: [courier-users] Courier-MTA + Greylisting|
|From:||Tim Lyth (tc...@tcl.homedns.org)|
|Date:||Mar 11, 2009 4:12:41 am|
Alessandro Vesely wrote:
On my system, about 18-20% of the grey listed email eventually gets delivered. Of the 20% that gets delivered, about 50% of that is spamtagged by SpamAssassin. About 80-85% of the connections to the server are rejected outright (RBL, invalid hostname, etc), before greylisting has a chance at the message. If greylisting was in front of our RBL and header checks, it's percentages of ultimately rejected spam would be much higher.
May I ask about whitelisting? Submitters, usual contacts and/or known hosts can be whitelisted
* from greylisting, to gain in immediateness, and * from SA, to avoid false positives.
Do you do that, either systematically or case by case?
Thanks for sharing statistics.
The greylisting module will auto-whitelist each triplet it sees after (by default) 5 minutes. If the sender tries to re-send the email (as per SMTP specifications) after the 5 minutes are up then the email will be let past the greylisting module. You can add your own whitelisted hosts/IP's as needed - information on how to do this is included with the greylisting module.
SA can also have whitelisted senders as well - useful if you've got clients receiving advertising email from a "genuine" source, but which is poorly formatted and often doesn't contain much plain text.
My email server through which this email I'm writing will be sent does both greylisting and then SA on all email passing through it. I find that the defaults for SA are mostly fine. I think I tweaked one or two lines in a configuration file for SA or greylisting, but can't remember which for certain, but "it just works" for me. SA will flag the spam and I use a filter in my email client to drop the spam in to a separate folder purely for holding the spam in.
So far this month, I've MAYBE had 1 or 2 spam get past greylisting and they were then caught by SA so I've had a good run of luck with them. As for how many email are getting stopped by greylisting, I couldn't tell you as I haven't filtered through the log files recently.
HTH, Tim Lyth
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