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Graylisting Question Last Post 02 Mar 2009 09:30 AM by Archie. 4 Replies. | Sort: |
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Thomas -
New Member
Posts:17
 | | 25 Feb 2009 04:56 PM |
| I got some complaints that a customer
fails to receive mail sometimes from a certain sender. I made some
investigation and found the following situation:
A first mail was accepted:
[SMTP 001639 15-02-09 00:05:24] Received SMTP Connection from 195.186.18.81
[SMTP 001639 15-02-09 00:05:24] 220 ms.3sweb.net ArGoSoft Mail Server SMTP Module v.1.0.6.0 at Sat, 14 Feb 2009 23:05:24 GMT
[SMTP 001639 15-02-09 00:05:24] EHLO tr11.bluewin.ch
[SMTP 001639 15-02-09 00:05:24] 250-Welcome 195.186.18.81, nice to meet you...
[SMTP 001639 15-02-09 00:05:24] 250-AUTH=LOGIN
[SMTP 001639 15-02-09 00:05:24] 250-AUTH LOGIN
[SMTP 001639 15-02-09 00:05:24] 250-ETRN
[SMTP 001639 15-02-09 00:05:24] 250 HELP
[SMTP 001639 15-02-09 00:05:25] MAIL FROM:
[SMTP 001639 15-02-09 00:05:25] 250 Sender "violinge@bluewin.ch" OK...
[SMTP 001639 15-02-09 00:05:25] RCPT TO:
[SMTP 001639 15-02-09 00:05:25] 451 Please try again after between 30 and 240 minutes.
[SMTP 001639 15-02-09 00:05:25] Greylisting...
[SMTP 001639 15-02-09 00:05:25] RSET
[SMTP 001639 15-02-09 00:05:25] 250 Reset state
[SMTP 001639 15-02-09 00:05:25] QUIT
[SMTP 001639 15-02-09 00:05:25] 221 Goodbye
[SMTP 001639 15-02-09 00:05:25] SMTP Connection with 195.186.18.81 ended
[SMTP 001645 15-02-09 00:14:20] Received SMTP Connection from 77.72.71.62
[SMTP 001645 15-02-09 00:14:20] 220 ms.3sweb.net ArGoSoft Mail Server SMTP Module v.1.0.6.0 at Sat, 14 Feb 2009 23:14:20 GMT
[SMTP 001645 15-02-09 00:14:20] Trusted IP or host
[SMTP 001645 15-02-09 00:14:20] EHLO 3S-WEB1
[SMTP 001645 15-02-09 00:14:20] 250-Welcome 77.72.71.62, nice to meet you...
[SMTP 001645 15-02-09 00:14:20] 250-AUTH=LOGIN
[SMTP 001645 15-02-09 00:14:20] 250-AUTH LOGIN
[SMTP 001645 15-02-09 00:14:20] 250-ETRN
[SMTP 001645 15-02-09 00:14:20] 250 HELP
[SMTP 001645 15-02-09 00:14:20] MAIL FROM:
[SMTP 001645 15-02-09 00:14:20] 250 Sender "ursula.jones@3sweb.net" OK...
[SMTP 001645 15-02-09 00:14:20] RCPT TO:
[SMTP 001645 15-02-09 00:14:20] 250 Recipient "violinge@bluewin.ch" OK...
[SMTP 001645 15-02-09 00:14:20] DATA
[SMTP 001645 15-02-09 00:14:20] 354 Enter mail, end with "." on a line by itself
[SMTP 001645 15-02-09 00:14:20] Appended to delivery queue with id 11921
[SMTP 001645 15-02-09 00:14:20] 250 Message accepted for delivery
[SMTP 001645 15-02-09 00:14:20] QUIT
[SMTP 001645 15-02-09 00:14:20] 221 Goodbye
[SMTP 001645 15-02-09 00:14:20] SMTP Connection with 77.72.71.62 ended
[SMTP 001645 15-02-09 00:14:20] Number of current SMTP connections: 1
The next mail was rejected and I do not understand the reason for that:
[SMTP 005266 19-02-09 10:05:12] Received SMTP Connection from 195.186.18.81
[SMTP 005266 19-02-09 10:05:12] 220 ms.3sweb.net ArGoSoft Mail Server SMTP Module v.1.0.6.0 at Thu, 19 Feb 2009 09:05:12 GMT
[SMTP 005266 19-02-09 10:05:12] EHLO tr11.bluewin.ch
[SMTP 005266 19-02-09 10:05:12] 250-Welcome 195.186.18.81, nice to meet you...
[SMTP 005266 19-02-09 10:05:12] 250-AUTH=LOGIN
[SMTP 005266 19-02-09 10:05:12] 250-AUTH LOGIN
[SMTP 005266 19-02-09 10:05:12] 250-ETRN
[SMTP 005266 19-02-09 10:05:12] 250 HELP
[SMTP 005266 19-02-09 10:05:12] MAIL FROM:
[SMTP 005266 19-02-09 10:05:12] 250 Sender "violinge@bluewin.ch" OK...
[SMTP 005266 19-02-09 10:05:12] RCPT TO:
[SMTP 005266 19-02-09 10:05:12] 451 Please try again after between 30 and 240 minutes.
[SMTP 005266 19-02-09 10:05:12] Greylisting...
[SMTP 005266 19-02-09 10:05:12] RSET
[SMTP 005266 19-02-09 10:05:12] 250 Reset state
[SMTP 005266 19-02-09 10:05:12] QUIT
[SMTP 005266 19-02-09 10:05:12] 221 Goodbye
[SMTP 005266 19-02-09 10:05:12] SMTP Connection with 195.186.18.81 ended
[SMTP 005281 19-02-09 10:26:59] Received SMTP Connection from 195.186.18.81
[SMTP 005281 19-02-09 10:26:59] 220 ms.3sweb.net ArGoSoft Mail Server SMTP Module v.1.0.6.0 at Thu, 19 Feb 2009 09:26:59 GMT
[SMTP 005281 19-02-09 10:26:59] EHLO tr11.bluewin.ch
[SMTP 005281 19-02-09 10:26:59] 250-Welcome 195.186.18.81, nice to meet you...
[SMTP 005281 19-02-09 10:26:59] 250-AUTH=LOGIN
[SMTP 005281 19-02-09 10:26:59] 250-AUTH LOGIN
[SMTP 005281 19-02-09 10:26:59] 250-ETRN
[SMTP 005281 19-02-09 10:26:59] 250 HELP
[SMTP 005281 19-02-09 10:26:59] MAIL FROM:
[SMTP 005281 19-02-09 10:26:59] 250 Sender "violinge@bluewin.ch" OK...
[SMTP 005281 19-02-09 10:26:59] RCPT TO:
[SMTP 005281 19-02-09 10:26:59] 550 Graylisting delay has not been met for more than 20 times. Mail will be rejected...
[SMTP 005281 19-02-09 10:26:59] Too many greylisting violations
[SMTP 005281 19-02-09 10:26:59] RSET
[SMTP 005281 19-02-09 10:26:59] 250 Reset state
[SMTP 005281 19-02-09 10:27:00] QUIT
[SMTP 005281 19-02-09 10:27:00] 221 Goodbye
[SMTP 005281 19-02-09 10:27:00] SMTP Connection with 195.186.18.81 ended
I understood that graylisting should store a successful connection and not ask for retry after that.
But I may be wrong. Could someone explain me what happened here?
Thanks for any help
Thomas
| | | Thomas Jakober
3S System Software Support
http://www.3sweb.net |
|
|
Steve Topilnycky
Forum Administrator
Veteran Member
Posts:1278
| | 25 Feb 2009 11:21 PM |
| Thomas,
Based on your logs, The set has 8 hrs 56 min gap between attempts and the second as 21 min gap. Now the 451 message states try again between 30 and 240 minutes (4 hours). As you can see both messages from the logs did not meet this criteria, one was too soon, the other to long. You may have to tweak your Grey listing parameters. I do no use this feature, so I can not advise you further on this matter. | | - - - - - - -
Regards,
Steve Topilnycky
Top Cat Computing
http://www.topcatcomputing.com/ | |
| Archie
ArGoSoft Developer
Basic Member
Posts:152
| | 26 Feb 2009 08:25 AM |
| Hi Thomas,
Please go to Security - Anti Spam - Greylisting, and decrease "Initial Delay..." and so on value from 30 minutes to 10.
The problem is, according to greylisting, connections which retry "too soon" should be considered as a potential spam. Before I was using default value 30 there, but it turned out it was too long... Make it 10. New default value is 10.
Archie
| | | |
| Thomas -
New Member
Posts:17
| | 26 Feb 2009 09:37 AM |
| Thanks alot. I have set it to 10 and I observing further to look if it is better.
Actually turning on greylisting did reduce alot the spam so I think it is a good method.
Thomas
| | | Thomas Jakober
3S System Software Support
http://www.3sweb.net | |
| Archie
ArGoSoft Developer
Basic Member
Posts:152
| | 02 Mar 2009 09:30 AM |
| Yes, I believe, greylisting is one of the best...
Archie
| | | |
|
| You are not authorized to post a reply. |
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