helo everybody,

from couple of days iam not able to send any mail from my mail server. my all mails are blocked as spam mail. because i don't have any static ip. itseem we installed tata 1 mbps broadband connection with one static ip address. this broadband router connected to linksysys broadband and voice router's internet port. linksys broadband and voice routers ip is 192.168.15.1, 255.255.255.0.from this linksys routers ethernet port we are connecting the internet to the linux firewall's etho(192.168.15.2, 255.255.255.0) port, in this linux server we have two ethernet cards, one for internet and another one eth1 (10.1.0.1, 255.255.255.0)for lan. using port forwarding we are runing this linux firewall. for mail server we r using (linux) fetchmail and sendmail (10.1.0.3 , 255.255.255.0). mail receiving is not a problem for me. within my domail sending mail is ok but only the problem is iam not able to send any mail to other domains like gmail, yahoo, sify.... etc. so please tel me where i need to use the static ip? and how? my static ip is a class A ip with 255.255.255.0 subnet.

Hello, so are you saying that you can't send emails outside of your local area network?

<H4>Outgoing Mail

The process is different when sending mail via the mail server. PC and Linux workstation users configure their e-mail software to make the mail server their outbound SMTP mail server.
If the mail is destined for a local user in the mysite.com domain, then sendmail places the message in that person's mailbox so that they can retrieve it using one of the methods above.
If the mail is being sent to another domain, sendmail first uses DNS to get the MX record for the other domain. It then attempts to relay the mail to the appropriate destination mail server using the Simple Mail Transport Protocol (SMTP). One of the main advantages of mail relaying is that when a PC user A sends mail to user B on the Internet, the PC of user A can delegate the SMTP processing to the mail server.

Note: If mail relaying is not configured properly, then your mail server could be commandeered to relay spam. Simple sendmail security will be covered later.

Try reading this page: Quick HOWTO : Ch21 : Configuring Linux Mail Servers - Linux Home Networking
</H4>

If you think your problem is still with port forwarding then get back to me and I'll see what I can do.

Regards

Martin