mail server to get mail from ISP
 

i am using centos 5 in my office our office employes using ms outlook to get mail from our ISP mail server is there any chance to get all the employes mail from our isp in my linux box to push the mail to our employes using my linux box

hi,
nothing to change your setting,
note down the incoming and outgoing server ip or dns name, then check if authentication required or not?

then same thing to configure in ur linux box

You can use fetchmail to do that

using fetch mail can i pull and push the mail betwwen our remote mail server and our office employes . if it possible should i configure DNS configuration in my linux box

and can i filter the spam mail

i tyried with fetchmail suing some tutorial i can get the mail from remote server it is sored in /var/spool/mail/user.

how to deliver this mail to my lan clients ms outlook

your lan clients need to point their clients to your mail server to get their mail

use Fetchmail as others have suggested, then you need a POP3/IMAP mail server, my recommendation would be dovecot. Download the mail using fetchmail onto your dovecot server, then point your clients on the LAN to the linux box and your rolling!

if you want to route outgoing smtp traffic via your linux box then also look at postfix or sendmail. although its not overly necessary to do that the alternative is to route your smtp traffic via your current smtp server at your ISP

HTH

BlackFish

for configure sendmail should i configure the DNS server in my linux box.

You don't need your own dns server to send mail (although you need access to one). If you can resolve domain names from your server (using exernal dns or whatever) you should be fine.