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ESA
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WSA is HTTP proxy whereas ESA is SMTP proxy.
![author](https://www.networkbulls.com/ask/public/images/trainer/2017-07-05-12-19-38-PiyushKataria (2).jpg)
Its a Email proxy server working for applications working at port 25.
Actually ESA will be having a database with ...
![author](https://www.networkbulls.com/ask/public/images/trainer/2017-07-05-12-19-38-PiyushKataria (2).jpg)