Answer
GMS Proxy uses the same Internet connection as your mail server and provides connectivity using GMS native services therefore requiring no additional services, SSL certificates, FTP servers, RAS connections or CPU overhead on the server. Additionally, GMS Proxy is configured through the same interface as GMS and GMS Webmail seamlessly integrating it into the whole product suite.
This means GMS Proxy requires nothing additional to run and shares the resources already allocated to other installed GMS products.
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