Gmail offers imap amd smtp access. You have to enable 2FA, and then it will allow you to create account for so called “less secure apps”.
In your place, I’d either continue using gmail directly, or finish the configuration of the self hosted mail server and just use that with any smtp/imap client. I suggest getting a separate domain for testing first, before moving your primary inbox there.
Flirc cases are nice, but the rubber parts do not handle the high temperatures well.
One of my pis is running inside a cupboard, so not ideal in terms of ventilation. The rubbery top and bottom of the case has started to dissolve into a sticky oil that was a bitch to clean up. The plastic underneath looks OK, so once the rest of it dissolves it will look normal again.
The other pi with the same case that’s out in the open shows no signs of degradation.