I’ve been running my email server for a year now. I have my domain, my email addresses, my email server, so if you send me an email, it will go through the least possible number of hops into my brain. However, up until now, I send my emails through a 3rd party vendor, SendGrid, for the simple reason which is to reach my recipients reliably. One very prominent email provider that starts with the letter G has caused me the most troubles.