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List:       exim-users
Subject:    Re: [exim] Funny and sad side of grey listing when they have multiple
From:       Lasse Birnbaum Jensen <gymer () odense ! kollegienet ! dk>
Date:       2006-01-29 9:58:37
Message-ID: 43DC91CD.2020603 () odense ! kollegienet ! dk
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Lasse Birnbaum Jensen wrote:
> I use the /24 subnet instead of the specific ip address that work were well
> 
> It done via mysql calls in exim.conf and work great
> 

Forgot to mention, i use the same backend database for all my mx servers

> /Lasse
> 
> Paul wrote:
> 
>> This is not a problem with exim - but others may notice it in their 
>> logs, and since I did not immediately twig to the cause, I thought I'd 
>> post it on this list to help others...
>>
>> On a routine trawl through my logs, I noticed one of the sites 
>> regularly sent to is now greylisting - so far so good, exim doesn't 
>> care and beyond that it uses more of my resources for each message 
>> neither do I... but now for the funny bit - initially I thought the 
>> exim retry mechanism was broken (it isn't) because there was an 
>> (almost) instant retry on the temporary failed delivery... then I 
>> worked out why - take a look at this log below (email addresses 
>> altered to protect the guilty).
>>
>> 2006-01-28 19:02:06 1F2l24-0000rB-2E <= abc@steamengine.com.au 
>> H=([203.12.35.101]) [203.12.35.101] P=esmtp S=829 
>> id=43DB325B.3050907@steamengine.com.au
>>
>> Initial try fails because of grey listing
>> 2006-01-28 19:02:13 1F2l24-0000rB-2E SMTP error from remote mail 
>> server after RCPT TO:<abc@hotkey.net.au>: host vscan2.hotkey.net.au 
>> [202.138.0.45]: 450 <abc@hotke
>> y.net.au>: Recipient address rejected: Policy Rejection: Hotkey 
>> Greylisting in progress ... Please try again after 2 minutes
>>
>> A subsequent try, almost immediately - this is what made me think my 
>> retry config was wrong
>> 2006-01-28 19:02:19 1F2l24-0000rB-2E SMTP error from remote mail 
>> server after RCPT TO:<abc@hotkey.net.au>: host vscan3.hotkey.net.au 
>> [202.138.0.46]: 450 <abc@hotke
>> y.net.au>: Recipient address rejected: Policy Rejection: Hotkey 
>> Greylisting in progress ... Please try again after 2 minutes
>>
>> And another subsequent, try, again, almost immediately
>> 2006-01-28 19:02:20 1F2l24-0000rB-2E == abc@hotkey.net.au R=dnslookup 
>> T=remote_smtp defer (-44): SMTP error from remote mail server after 
>> RCPT TO:<abc@hotkey.net.a
>> u>: host vscan1.hotkey.net.au [202.138.0.44]: 450 <abc@hotkey.net.au>: 
>> Recipient address rejected: Policy Rejection: Hotkey Greylisting in 
>> progress ... Please try again af
>> ter 2 minutes
>>
>> Finally it gets through...
>> 2006-01-28 19:25:19 1F2l24-0000rB-2E => abc@hotkey.net.au R=dnslookup 
>> T=remote_smtp H=vscan1.hotkey.net.au [202.138.0.44]
>> 2006-01-28 19:25:19 1F2l24-0000rB-2E Completed
>>
>>
>> Then of course I realised why - the network hotkey.net.au has three MX 
>> hosts at 202.138.0.45, 202.138.0.46 and 202.138.0.44.
>>
>> This blew me away - what is the point of providing redundancy and 
>> scalability via MX, then those hosts each separately decide not to 
>> talk to you because of grey listing.
>>
>> Perhaps people doing grey listing should only have the one MX?
>>
>> I guess this is just another example of why grey listing is anti 
>> social - thankfully I'm not paying by data volume (many people in 
>> Australia still do) or I'd be more annoyed.
>>
>> I sent a message to the postmaster of the site and he had not realised 
>> it worked that way (I was surprised he answered - very rare for anyone 
>> to answer a postmaster message these days) - all he has done is 
>> whitelist my domain in whatever software he uses - good for me, but 
>> still poor for everyone else.
>>
>> Regards
>> Paul
>>
> 
> 


-- 
Venlig hilsen / Best regards
Lasse Birnbaum Jensen

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