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Old 11-03-2003, 09:17 AM   #1
Registered: Aug 2003
Location: Johannesburg, South Africa
Distribution: RedHat 9.0; SmoothWall Express
Posts: 43

Rep: Reputation: 15
Which program to use?

I am using RH9 (Command Line) as Server.

I want to use a program to send our company e-mail out to the Internet.
Currently we are making use of our ISP's relay server, but we are losing quite a lot of e-mails that is just disappearing into the Internet Void.

I don't want any mailboxes. It must just be a mail relay server.
Can anyone suggest a easy program that can handle just the relay?

Our ISP suggested Windoze with VPOP3, but since our server is Linux I am sure we will have something Linux out there that is easy to setup.

We do have a public IP.

Old 11-03-2003, 09:58 AM   #2
Registered: Apr 2003
Location: Netherlands
Distribution: SuSE (before: Gentoo, Slackware)
Posts: 613

Rep: Reputation: 30
a mailbox hasn't got anything to do with an e-mail relay host.. receiving or sending e-mail can be 2 different things

you could install postfix. (an alternative to sendmail). You'll be able to run a Mail Transfer Agent (SMTP server) on your server, and you don't need the SMTP server of your ISP anymore.

instead of using, you could use (ie: localhost)

This is what will happen:
* mail programs connect to your MTA (postfix). ie; use /usr/sbin/sendmail, or connect to (localhost) on port 25. (smtp)
* the MTA will use DNS resolving to find the MX record (mail exchange) of the destination. for example, to send an e-mail to, it could deliver the message to
* your postfix server will communicate with that other MTA, instead of the MTA of your ISP. this chain continues until the message is received by the final destination.

If an MTA receives an e-mail (at port 25 off course), it will decide what to do:
- it could forward the message.
- it could store the message in a local mailbox; postfix will use a program like maildrop or procmail for this. (for example, /var/spool/mail, or ~/Maildir) Since you're only sending e-mail to others, you don't really have a mailbox.

home users usually don't run an mail server all the time, so they use POP3 or IMAP to access a remote mail box at their ISP.

Messages that could not be delivered will be returned to the original sender.

Last edited by yapp; 11-03-2003 at 10:01 AM.


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