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4.4

Mail not being delivered to mailserver through iptables firewall

Asked by ljunckersr in Miscellaneous Networking, Networking Hardware Firewalls, Red Hat Linux

Tags: iptables

I have two Red Hat 7.3 machines set up.......

First Machine named webserver.aljnet.net  
     eth0 connected to internet and working very well
     eth1 connected as 192.168.0.1
     running iptables firewall with forwarding of ports 25 and 110 to 192.168.0.11

Second Machine named mail.aljnet.net
     eth0 connected as 192.168.0.11
     with no firewall running

I am using iptables and virtual networking on Apache

I have used QmailRocks.org Qmail setup and everything works perfect from machine 2.
I can send an email to ANY of the accounts that have been created and view them via telnet or retrieve them via Outlook on another machine with the server setting of mail.aljnet.net

My dilema is that if I try and send an email to one of my addresses, from any machine but machine 2, the message never gets to the queue or the mailboxes.

I have the following rules set up in my iptables-firewall

Chain INPUT (policy DROP)
target     prot opt source               destination        
ACCEPT     tcp  --  anywhere             anywhere           tcp dpt:smtp
ACCEPT     udp  --  anywhere             anywhere           udp dpt:smtp
ACCEPT     all  --  anywhere             anywhere          
ACCEPT     all  --  webserver.aljnet.net  anywhere          
ACCEPT     all  --  homemain.aljnet.net  anywhere          
ACCEPT     all  --  mail.aljnet.net      anywhere          
ACCEPT     all  --  webserver2.aljnet.net  anywhere          
ACCEPT     all  --  gameserver.aljnet.net  anywhere          
badflags   tcp  --  anywhere             anywhere           tcp flags:FIN,SYN,RST,PSH,ACK,URG/FIN,PSH,URG
badflags   tcp  --  anywhere             anywhere           tcp flags:FIN,SYN,RST,PSH,ACK,URG/FIN,SYN,RST,PSH,ACK,URG
badflags   tcp  --  anywhere             anywhere           tcp flags:FIN,SYN,RST,PSH,ACK,URG/FIN,SYN,RST,ACK,URG
badflags   tcp  --  anywhere             anywhere           tcp flags:FIN,SYN,RST,PSH,ACK,URG/NONE
badflags   tcp  --  anywhere             anywhere           tcp flags:SYN,RST/SYN,RST
badflags   tcp  --  anywhere             anywhere           tcp flags:FIN,SYN/FIN,SYN
ACCEPT     icmp --  anywhere             anywhere           icmp echo-reply
ACCEPT     icmp --  anywhere             anywhere           icmp destination-unreachable
ACCEPT     icmp --  anywhere             anywhere           icmp time-exceeded
ACCEPT     icmp --  anywhere             anywhere           icmp echo-request limit: avg 1/sec burst 5
firewall   icmp --  anywhere             anywhere          
ACCEPT     tcp  --  anywhere             anywhere           tcp dpt:ssh
ACCEPT     tcp  --  anywhere             anywhere           tcp dpt:http
ACCEPT     tcp  --  anywhere             anywhere           tcp dpt:https
ACCEPT     udp  --  anywhere             anywhere           udp dpt:domain
ACCEPT     tcp  --  anywhere             anywhere           tcp dpt:domain
ACCEPT     all  --  anywhere             anywhere           state RELATED,ESTABLISHED
ACCEPT     udp  --  anywhere             anywhere           udp dpt:nfs
ACCEPT     tcp  --  anywhere             anywhere           tcp dpt:nfs
silent     udp  --  anywhere             anywhere           udp spt:netbios-ns dpt:netbios-ns
dropwall   all  --  anywhere             anywhere          

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination        
DROP       all  --  anywhere             anywhere           state INVALID,NEW

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination        

Chain badflags (6 references)
target     prot opt source               destination        
DROP       all  --  anywhere             anywhere          

Chain dropwall (1 references)
target     prot opt source               destination        
DROP       all  --  anywhere             anywhere          

Chain firewall (1 references)
target     prot opt source               destination        
DROP       all  --  anywhere             anywhere          

Chain silent (1 references)
target     prot opt source               destination        
DROP       all  --  anywhere             anywhere    

I have been fighting with this for two days, searching everywhere, tryiny everything, and it is probably something very simple that I am overlooking.

I can include my actual iptables-firewall script if necessary.

Any help on this situation would be GREATLY APPRECIATED!!!!!!!
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Zones: Miscellaneous Networking, Networking Hardware Firewalls, Red Hat Linux
Tags: iptables
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Solution Provided By: brabard
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Solution Grade: A
 
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