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can't send or recive any emails



when i send an e-mail form yahoo or my mail server i get this error 
 
 
Remote host said: 550 5.0.0 Access denied
what is the problem ?

 this is my configurtion for my iptables firewall
 Chain INPUT (policy ACCEPT)
 target     prot opt source               destination
 DROP       all  --  0.0.0.0/0            0.0.0.0/0           state INVALID
 ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state NEW
 ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED
 ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:80
 ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:143
 ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:53
 ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:67
 ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:443
 LOG        all  --  0.0.0.0/0            0.0.0.0/0           LOG flags 0 level 4
 
 Chain FORWARD (policy ACCEPT)
 target     prot opt source               destination
 ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
 ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
 
 Chain OUTPUT (policy ACCEPT)
 target     prot opt source               destination
 ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:67
 ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:80
 ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:53
 ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:443
 ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:80 state RELATED,ESTABLISHED
 
 
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