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Huge mail delay (ident callback?)

Posted on 2006-10-24
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Last Modified: 2010-05-18
Hello,

All the mail we receive comes with a delay, some with a delay of like 2 hours.

Now my isp tells me that this can be changed by setting ident callbacks to timeout in 0 seconds or disabling ident callbacks,well i looked under every rock on the internet and cannot find a solution, anyone ?

We are using Exchange 2003, where we use an external mail relay server of our isp that does not allow ident callbacks.
Port 25 is closed inbound so we have to use their mailrelay server.
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Question by:testycle
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by:Sembee
ID: 17795098
I am pretty sure "ident callbacks" is what Exim calls reverse DNS lookup. Have you got that function enabled on the SMTP virtual server?

Simon.
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by:testycle
ID: 17795113
i've got that disabled already but still the delay is there, it's a delay of like 1:15..
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Sembee earned 500 total points
ID: 17795224
Can the ISP prove that the problem is not with their setup?

I have zero confidence in ISP mail servers. I have seen messages disappear in to their mail servers and not come out again for six weeks and the ISP will not admit it is their problem (even with the headers). Unless you are in one of those areas where you have no choice on ISP, I would be looking for another one right now.

There is nothing in a native installation of Exchange that could cause those sorts of delays.
What else is installed on the server? Anything else that scans the email messages? Antivirus, antispam etc? Does the Exchange server answer SMTP traffic or is it something else? Appliance or application for example?

Simon.
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Author Comment

by:testycle
ID: 17801871
Sembee you are right it was not my exchange setup but the mailrelay of the isp :(
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