Mail Poller Plugin Configuration

Hello,

we are doing first time set up of this plugin and facing connection time out issue, No error other than time out message. We are on cloud latest version and using VPN to connect cloud. We followed all steps in the installation guide not sure are there any additional DNS port settings we need too consider for successful connection. any thoughts?

Thanks for help

"Couldn't connect to host, port: testmail.net, 993; timeout -1"