Syncthing is great, but no good for mobile devices if you want to store and access lot of large files - it syncs everything, and last I checked, the features to prevent that were depreciated.
I did the same thing some years ago. I chose purelymail[0] as the MX for my personal domain and would recommend. The only issue is that it's so cheap, and my credit lasts so long, I forget that it is in fact a paid service and that I do actually need to make a payment from time to time...
[1]https://www.ambulance.qld.gov.au/