Setting up email on behalf of client?

I’m pretty new to web development and especially WordPress. I’m trying to figure out the best way to set up email primarily as e-commerce receipts/order confirmation and marketing/newsletters. Most of the options I’ve seen look like they require setting up an email through a third party and importing an API key which would be easy enough if I was doing this for myself. The main question I have is how I can do this on behalf of somebody else so they have control over it when I’m done?

From what I can tell it looks like the options are to pretty much do it myself and send them all of the relevant logins and such or to walk them through doing it which both seem to be not ideal.

Is there a better way to do this? Thanks in advance!

 

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