[Exim] Too many mail coming through secondary mail server

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Author: Sujit Choudhury
Date:  
To: exim-users
Subject: [Exim] Too many mail coming through secondary mail server
We have two Mats with gouda being the primary. Shook-up shows the
following:
wmin.ac.uk      preference = 10, mail exchanger = panther.wmin.ac.uk
wmin.ac.uk      preference = 5, mail exchanger = garuda.wmin.ac.uk


The two configuration are identical except
For the primary: rfc1413_query_timeout=7s
For the secondary: rfc1413_query_timeout=4s

However lot of mail (approximately 10%) still comes to the secondary,
even from outside.
Can anybody suggest what can be done to reduce the number of mail to
secondary mail server?

Regards

Sujit
-----------------------------------
Sujit Choudhury
ISLS
University of Westminster
115 New Cavendish Street, London
E-Mail: S.Choudhury@???
Tel No: 020 - 7911 5000 Ext 3851