On Fri, Oct 05, 2001 at 12:13:02AM -0500 or thereabouts, Matthew Garman wrote: > > Does anyone out there have a home LAN setup using non-routable IP > addresses (e.g. 192.168.x.x)? And if so, do you have postfix running as > the MTA on more than one machine in the LAN? > Yes.
> Have you been able to get postfix to send mail to different machines on > the LAN (completely internal, no external DNS routing)? > Yes. I have 4 computers all sitting behind a cable modem. One of the computers is running woody and is the firewall/gateway/router and does NAT for the other computers. One of the computers behind the firewall computer is a mail server using postfix. I have all of my other computers route mail through it to go to the internet (and they all use postfix as the mta). I am not a postfix expert, but this definitely works. Here is the important part for the mail server: in main.cf, I added: myhostname = smtp.fake.cxm mydomain = fake.cxm myorigin = /etc/mailname # this is who we accept mail for mydestination = $myhostname $mydomain localhost.$myhostname localhost.$mydomain disable_dns_lookups = yes # set to your ISP to send mail to the internet relayhost = smtp-server.your-isp.com # we do this instead of dns on our LAN transport_maps = hash:/etc/postfix/transport contents of /etc/postfix/transport: # run 'postmap /etc/postfix/transport' and restart postfix to change fake.cxm smtp: .fake.cxm smtp: smtp.fake.cxm local: localhost.fake.cxm local: Using the transport maps (along with disable_dns_lookups) allows all this to work, even with a fake domain name and ip addresses. You can also add to main.cf: # run 'postmap /etc/postfix/sender-canonical' and restart postfix to change sender_canonical_maps = hash:/etc/postfix/sender-canonical If sending mail to the internet, the sender_canonical maps comes in handy because you can rewrite addresses coming through this machine so that they come from a valid email. My isp requires this, so I just have all mail rewritten so the From field is from my email address through my isp. Eg, /etc/postfix/sender-canonical: @smtp.fake.cxm [EMAIL PROTECTED] @workstation1.fake.cxm [EMAIL PROTECTED] @localhost.fake.cxm [EMAIL PROTECTED] Ok, the other computers on the network can have the following 'satellite' configuration: myhostname = workstation1.fake.cxm mydomain = fake.cxm myorigin = /etc/mailname relayhost = smtp.fake.cxm Keep in mind, the parts I gave are just what I modified, everything else is default. I also run bind, so 'smtp.fake.cxm' actually resolves to an ip on my network (eg 192.168.1.4). You should be able to accomplish the same with /etc/hosts. Also note that this works because anything that postfix doesn't know where to send on workstation1, it just sends to its relayhost (smtp.fake.cxm). It also will receive mail for itself. smtp.fake.cxm will get this mail, and will either deliver to a local user if the destination is for smtp.fake.cxm, send it on to another computer on the network if it is destined for that computer (because of the transport map), or send it to the its relayhost (the isp smtp server) if it doesn't know what to do with it. Works very well for me. -- GPG/PGP Info Email: [EMAIL PROTECTED] ID: 26384A3A Fingerprint: D9FF DF4A 2D46 A353 A289 E8F5 AA75 DCBE 2638 4A3A --
