[CentOS] Postfix dropping settings CentOS4.5

[Feizhou]

Johnny Massengill wrote:
> My company is using Trend Micro InterScan Messaging Security Suite 7.0
> for linux. This setup uses Postfix as a mail gateway for MS Exchange.
> The problem I'm having is ever so often Postfix 2.2.11 will lose the
> Transport mapping lookup tables setting. When this happens, mail into
> our domain will stop being relayed to our Exchange server.
> 

What mapping tables are those? mysql? ldap? ???

This has never happened with me whether cdb, berkely db or mysql for 
thousands of domains in a previous job at an ISP (older version) and nor 
do I have any such problem with postfix 2.2.11 which I currently run in 
my current place of work.