External Server option allows you to assign an external VPS server location path to use the installed custom scanner system package from those locations. This reduces the main server load and allows better management of server location to verify email addresses during blacklist issues. Using this feature will ignore main server system for scanning where email verifier pro script has been installed. All data communication for verification takes place over API. You can add as many External servers you want.
Prerequisite
External Servers must follow the same official requirements spec to work as mail servers. Make sure you have configured and set up each server to work as a proper mail server system.