tell sendmail to use a different dns server?

[Zhang Weiwu]

Hello. I'm using the dns service on a router box. This router does provide 
dns service, on which every computer in the LAN has a local domain name 
(computername.our.lan)

Now the built in dns server's function is limited; it does not relay MX 
type of record. Thus sending mail using sendmail always get hostname lookup 
failure. 

1. If I change my name server address in resolv.conf to use my ISP's dns 
server, I cannot access lan computers using local hostnames.
2. If I use our dns server, I cannot send mails through sendmail.

So what should I do? Can I ask sendmail to use ISP's dns server, while the 
rest programs use local dns server?

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