Author: Kerry Seibold Date: To: exim-users Subject: Re: [exim] DNS list lookup defer (probably timeout)
Thanks Renaud,
I will take your advice.
Cheers,
Kerry.
>
>
> Kerry Seibold wrote:
>> Hi,
>> I am using exim 4.51 on FC3.
>>
>> RBL lookups take a very long time if the ip address is not listed, resulting in, for example:
>>
>> DNS list lookup defer (probably timeout) for 240.218.158.202.sbl.spamhaus.org: assumed not in list
>>
>> The relevant section of my exim.conf is:
>>
>> deny hosts = !127.0.0.1
>> message = rejected because $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text
>> dnslists = sbl.spamhaus.org:relays.orbd.org:dnsbl.njabl.org:dnsbl.sorbs.net
>>
>> www.dnsreport.com on my mailserver reports:
>>
>> ERROR: I could not complete a connection to any of your mailservers!
>>
>> mail.mydomain.com: Timed out [Last data sent: RCPT TO: ]
>>
>> If this is a timeout problem, note that the DNS report only waits about 40 seconds for responses, so your mail *may*
>> work fine in this case but you will need to use testing tools specifically designed for such situations to be
>> certain.
>>
>>
>> If I comment out that section in my exim.conf www.dnsreport.com reports:
>>
>> OK: I was able to connect to all of your mailservers.
>>
>> I've googled and searched the exim archives.
>>
>> Is there some way I can fix this?
>>
>
> You should first remove relays.ordb.org as this list doesn't work for
> quite some time now.
> It should also be noted that MTA are required to wait much more than 40s
> by RFC2821. So, even if dnsstuff reports something like a timeout, they
> are not respecting RFCs for timeouts anyway. As another example,
> dnsstuff will report that you don't accept postmaster if you block
> bounces to multiple recipients. As long as you know you are not doing
> something wrong, dnsstuff only brings some advises, not a certainty.
> --
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