[qmailtoaster] firewall rules

[sysadmin]

Hi Guys, trying to tighten up the qmail server more:
Can I close any of these ports: not sure waht they may be needed for:
tcp dpt:20
tcp dpt:21
tcp dpt:23
tcp dpt:43
udp dpt:123
tcp dpt:953
udp dpt:953
tcp dpt:993
tcp dpt:995

Thanks all


madmac