Email not being sent

I run this command to check if the firewall blocked outgoing emails

# iptables -L | more

Code: 
Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     tcp  --  anywhere             anywhere           tcp dpt:smtp OWNER GID match mail 
ACCEPT     tcp  --  anywhere             anywhere           tcp dpt:smtp OWNER GID match mailman 
ACCEPT     tcp  --  anywhere             anywhere           tcp dpt:smtp OWNER UID match root 
REJECT     tcp  --  anywhere             anywhere           tcp dpt:smtp reject-with icmp-port-unreachable 
acctboth   all  --  anywhere             anywhere
I am not expert in dealing with iptables results but I think there is something wronge there

can anyone help

thanks

 

 

 

 

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