> -----Original Message----- > From: Brent Canipe > Sent: Tuesday, December 03, 2002 2:50 PM > Subject: Sendmail and firewall problem. > > > Hey Guys, > I know I'm not the only one that has run into this. > But right off hand I don't know how to fix it. > > I have a NAT filewall with a public IP address. > Behind the firewall is my mail server which has a > private ip address 192.168.80.30. The firewall is > set to pass trafic for certain ports to 192.168.80.30 > > That part all works fine.. > > The problem is my outbound e-mail. > since the mail is being reported as from a server with a > private address (192.168.80.30) it gets rejected by > other servers around the net because the address is > non resolvable. > > Is there a way to tell sendmail to report a differant > address? like my firwalls address?
You can always configure sendmail to bind to another ip address (see the DAEMON_OPTIONS in your redhat supplied .mc file), but since your behind a NAT'd firewall I think your only option would then be to implement a proxy arp solution (versus NAT). You can also change the FQDN that sendmail announces itself as during the EHLO handshake by changing the $j macro definition in your .mc file. i.e. Change it to match the FQDN of your firewall's public IP. EX: define(`confDOMAIN_NAME', `mail.mydomain.com')dnl FWIW: I have an identical network design as yours. e.g. My sendmail server is NAT'd behind a linux based firewall. I have NOT experienced the reporting problem you describe by remote MTA's. Yes, the first hop e-mail header contains a 192.168.x.x address (look at the header of this e-mail), but my public IP address of my firewall is reported during the EHLO handshake with the remote MTA. So far (over 4 years) I have not had an MTA reject an e-mail from my server. Are you sure this is not a DNS problem (like reverse lookup)? Steve Cowles -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED]?subject=unsubscribe https://listman.redhat.com/mailman/listinfo/redhat-list
