We wouldn't know if a private email was configured similarly, or if emails on a private server were manually deleted. Either way, yes using a communication sys

We wouldn't know if a private email was configured similarly, or if emails on a private server were manually deleted. Either way, yes using a communication system on the public internet and outside of official documentation processes is bad no matter how you do it. Deleting those communications could be a bad sign, though to be fair it could also be a sign of someone trying to do what they think is more secure (avoiding old messages being leaked or hacked later).