problem with my mail server and/or name server

[jfall]

I have a domain (jaymefall.com). I am hosting the domain from my Linux computer. I have a name server running. My linux computer has two network cards, one gets an IP via DHCP from my DSL and the other acts as a gateway so I can use the internet connection from my networked Windwos XP computer using IPtables.

Everything works fine except that I setup a mail server the other day and I am trying to use it from my Windows XP networked computer. My mail servers are mail.jaymefall.com. I can receive mail just fine, but when I try to send a message I get the following message from Outlook Express:

"The message could not be sent because one of the recipients was rejected by the server. Account mail.jaymefall.com, Server: "mail.jaymefall.com" protocol SMTP, server response 550.5.7.1. Relaying denied. IP name lookup failed (192.168.10.1) port 25, secure(ssl) no, server error. 550 Error number 0x800ccc79."

I am guessing that for some reason it cannot do a reverse lookup on 192.168.10.1 (which is the internal IP address of my Windows XP computer. There must be something that I have to add to my name server config to get it to do this. Does anyone have any idea what I might have to do?

[jumpedintothefire]

You'll need to edit some config files, /etc/mail/access should have some entries for the hosts or network you need to relay for.

read about:

FEATURE(`access_db', `hash /etc/mail/access')

at:

http://www.sendmail.org/m4/anti-spam.html

remember to makemap hash after you edit that file.