I have configured for one email user with fetcmail+procmail+dovecot+senmail in my linux box to retrive mail from our external mailserver. i did not configure DNS in my linux box (sorry for telling this i dont know wheather DNS is must for this setting) i am using MS outlook as mail client. using all these setting i can get mail from our external mail server. but iam not able to send email to outside. what should i do send email suing these setting

kindly give me some your valuable ideas

and one more question is this possible to retrive all users mail (nearly 70 users) using thsi seeting

The configuration I have used for some time now is very similar. All incoming messages are retrieved by fetchmail from ISP mailboxes and delivered to mailboxes on my intranet server after a good SPAM scan:
[mbox]
[mbox] -> fetchmail -> sendmail -> procmail -> spamc -> local-delivery
[mbox]

Outgoing mail is all sent to the local intranet server, the same one hosting fetchmail. Sendmail is configured to accept outgoing mail on the "submission" port and is configured to forward everything to my ISP SMTP server using the "smarthost" configuration option. Sendmail must be configured to recognise all of the external mailbox addresses as "local aliases" or you could end up with delivery loops.

Read through the fetchmail documentation to see if you can use it "multidrop" for your multi-user requirements. Fetchmail needs to be able to identify the intended recipient on every message to work well. This can be a real problem with messages delivered to more than one address within the same multi-drop mailbox. The alternative is to use the virtual address re-writing facilities of sendmail to re-route messages to the correct local mailbox.

So long as your server has working DNS settings the applications should work OK. Fetchmail does try to check every relay address in the message headers so it can slow things down. A little tuning goes a long way here. Consider running a "caching only" DNS server if it is still too slow.

Hope this helps,

--DaveG.

thanks for your reply i will configure smart host and i will reply soon.

i there any way to do this ( to send and receive mail from remote mailserver for multiple user)

Do all your users have their own mailboxes on the remote server?

On the sending side, if you don't want to run your own server, just set the smtp outgoing in outlook to your isp smtp server as suggested above

i tried with smarthost even iam not able to send mail to my remote server
what are the other configuration i have to check

What is the output of Are there errors in the logs when you send mail ? What is being reported in the logs ?