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That’s a combination of too simple/short in your sentences, mixed with too specific jargon with no clarification. It’s dumb as hell that people don’t know stuff like what a server is, but if they don’t you have to abstract it more.
My go to is some form of: I’m in IT, I do systems administration. I help keep all the things behind the scenes working so that everyone’s stuff works at my workplace. Less of making your email work, more of making everyone’s email work.
Obviously I work with a hell of a lot more than just email. I’m mostly scripting out custom automation jobs to bridge gaps in the integrations between different systems. But like you said, keep it simple.
Oh hello fellow email admin. What platform?