The following are all ports, which need to be open on the firewall in order for MDaemon to function properly:

SMTP inbound / outbound port - 25
MSA inbound port - 587
ODMR inbound port - 366
SMTP SSL port - 465
POP3 inbound / outbound port - 110
IMAP inbound port - 143
POP3 SSL port - 995
IMAP SSL port - 993
DNS outbound port - 53
LDAP port - 389
WebAdmin port - 1000
WorldClient port - 3000
Minger port - 4069

If you are using BlackBerry Enterprise Server:
BES - 3101 (Outbound TCP connection)