Postfix minimal configuration

**stokes** · 05-03-2005

What is the minimum I have to do to configure postfix to accept incoming SMTP messages and store them somewhere? I need to set up a mail server in a real hurry, it doesn't have to do anything fancy, just be the MX record for a domain containing 3 mailboxes for a couple of weeks. I don't really need pop or imap access to begin with if I can log on to the localhost and read it on there.

Or if it's easier to do this using sendmail let me know what I need to do ...

The only tutorials I can find are extremely long winded and involve steps that aren't necessary for what I want to achieve.

**swemic** · 05-04-2005

Insert this in your /etc/postfix/main.cf last of all

Code:

myhostname = your.host.and.domain
mydomain = your.domain
mydestination = $mydomain
mynetworks = 127.0.0.0/8

This would be the absolut minmal configuration that you would need to do.
All emails would end up att $LOCALUSER@$mydomain
If you want to set some alias on emails a simple VHOST configuration would be quite easy to set up as well.

Code:

virtual_maps = hash&#58;/etc/postfix/virtual

Create the file /etc/postfix/virtual
And this file should look like something like this:

Code:

your.domain                         anything
donald.duck@your.domain      usr1
mickey.mouse@your.domain   usr2

Then you have to enter the directory /etc/postfix and issue command

Code:

postmap virtual

Re-start your postfix server and you are set.
If you wish that all e-mails with unknown recipient address to be forwarded into a certain user add one line in your virtual file like this

Code:

your.domain                         anything
donald.duck@your.domain      usr1
mickey.mouse@your.domain   usr2
@your.domain                       usr3

You have to re-run the postmap command as described above on each change you do in your virtual file

**stokes** · 05-04-2005

Thanks!

I've done as you suggested and restarted the postfix server service, but it seems that port 25 is not open on the computer as I can't telnet on to it from the Internet. I have configured port forwarding on my firewall to route port 25 to the NAT address of my Mandrake box. How can I open the port? I had read that once you have configured your MTA the port would just open but it seems that is not the case!

The strange thing is nmap shows port 25 is open?!

Code:

&#91;root@mandrake postfix&#93;# nmap localhost

Starting nmap 3.55 &#40; http&#58;//www.insecure.org/nmap/ &#41; at 2005-05-04 16&#58;42 BST
Interesting ports on mandrake &#40;127.0.0.1&#41;&#58;
&#40;The 1634 ports scanned but not shown below are in state&#58; closed&#41;
PORT      STATE SERVICE
21/tcp    open  ftp
22/tcp    open  ssh
25/tcp    open  smtp
80/tcp    open  http
110/tcp   open  pop3

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