If you are trying to connect POP3 connection and getting connection refused error on server with this message :
"Maximum number of connections from user+IP"
Kindly check error logs through :
Please check the below logs.
Solution for this error :
To resolve this error you have to increase the value of "mail_max_userip_connections" from default.
To Edit run this command :
Now, check the parameter “mail_max_userip_connections” and increase it's value to higher form default.
mail_max_userip_connections = 20
Now save the file and restart exim.