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This doesn't work for me:
# iptables -A INPUT -p tcp --dports 110,143,993,995 -j ACCEPT
iptables v1.4.7: unknown option `--dports'
Try `iptables -h' or 'iptables --help' for more information.
However in the man page, there is an option --dports... any ideas?
You have to use --match multiport in the rule for defining more ports
#iptables -A INPUT -p tcp --match multiport --dports 110,143,993,995 -j ACCEPT
You need to specify the -m multiport module before using the dports options
-m multiport --dports 110,143,993,995 ...