@devSJR i have an email provider i'm moving off of (they are too aggressive with their blacklisting of ip space) but use them for testing systems. they are a standard postfix/dovecot setup with no frills. i can make a call to my other account without issue. (using #deltachat desktop and #arcanechat on #grapheneos)

it should be noted the optimal experience will be using a chatmail relay. standard email still works and there's no plans i know of to change it, but we package everything an operator needs in the deployment including the turn server.

if you want to test calls, please dm me and we can try it!