Specifications

MyPBX Standard Administrator Guide
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In this case, MyPBX can get rid of one-way volume issue.
Step5. Add common rules to accept the static public IP
range of NTP, SMTP, and POP server.
We recommend opening all ports for NTP, SMTP, and POP server in MyPBX’s
firewall, and the IP address should be a static one or it belongs to a range. If it’s
Dyndns, there is no need to configure this rule, but the IP blacklist should be
kept, and “Drop All” should not be ticked.
For example, the SMTP server is 110.30.1.123.
Name: Allow_SMTP
Protocol: BOTH
Port: 1:65535
IP: 110.30.1.123/255.255.255.255
Action: Accept
Figure 2-7
As for the rule of NTP and POP server, you can create it one by one.
Step6. Configure auto blacklist rules
Auto blacklist rules: the Server would add the IP address to the blacklist
automatically if the number of the packets it sends exceeds the rule you
configured.
Note: These 3 rules are created by MyPBX by default.