The connection limit determines how many simultaneous POP3 connections are allowed on the mail server. In order to increase Mail POP3 connection limit. One need to perform below mentioned steps:

1. Open Mail Enable Professional
2. Click on Servers
3. Click on localhost ---> Connectors ---> SMTP Properties ---> Inbound Tab
4. Change the numbers in Maximum number of concurrent connections.

Thanks,

Kenn G.
Accuwebhosting.com