Easy to install but slowed down my site drastically

This is a really good plugin and once I was able to install it, my emails stopped showing up with phishing scam warnings. However, there were too many gateway errors and my posts would no longer post! I reached out to my hosting company and they opened up like 6 different ports but only fixed the problem temporarily. Ultimately, I figured it wasn’t worth the headache. I’ll be looking for another plugin.