Hello

I am running a DNS and Sendmail on my internal linux behind of Linux Firewall(Router) (Red Hat Linux 7.3).

I can send and received mail within internally network but uable to send mail to yahoo and hotmail (unale to send Internet).

Following is the my current configuration :-
Internal Sendmail (Linux) : 192.168.1.131 including FQDN DNS is yokohoma.sateri.com (so dns is working fine.) and mx record.
I had test using telnet 192.168.1.131 25 from client and from server. and set querytype=mx.(working fine.)

Following is the my sendmail.mc configuration :-
define(`SMART_HOST',`smjet.com')
FEATURE(`access_db',`hash -o /etc/mail/access.db')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=192.168.1.131, Name=MTA')dnl
MAILER(local)
MAILER(smtp)
MAILER(procmail)dnl
Cwlocalhost.localdomain
Cwsateri.com
FEATURE(always_add_domain)dnl
FEATURE(masquerade_entire_domain)dnl
FEATURE(masquerade_envelope)dnl
FEATURE(allmasquerade)dnl
MASQUERADE_AS('sateri.com')dnl
MASQUERADE_DOMAIN(sateri.com)dnl
MASQUERADE_DOMAIN(localhost)dnl
MASQUERADE_DOMAIN(localhost.localdomain)dnl

Note : smjet.com is the ISP DNS Server.

/etc/mail/acess
192.168.1.131 RELAY (192.168.1.131 is the ip of internal sendmail server)
192.168.1. OK

/etc/mail/local-host
yokohoma.sateri.com

/etc/resolv.conf
nameserver 192.168.1.131
nameserver yokohoma.sateri.com

ISP - Linux Router - 192.168.1.98 --- eth0 is the internal LAN --------- eth1 is staitc IP (provided by ISP).

What I need to talk with ISP. What firewall rules i need to put in iptables.

Can anybody help out me to resolve this problem.

Please give a solution for this. Your help will more appreciate me.

Regards
Uday

Welcome to LQ.

From your server can you get connected to your ISPs mail server with:
telnet smjet.com 25

Hi,

I got the same problem once
for that give your server ip in the relay. It will work .