Some of what I want to send and receive by email might be considered illegal in Russia, so that's a hard no. I don't trust Russia's legal system to interpret the law in my favor. Does, for example, this email receipt for a book about a bi football player figuring out his sexuality count as propaganda? I wouldn't risk it.
Do you fear the Russian legal system though? Are you really doing anything so controversial that you’d motivate Russian Intelligence to care about a foreigner?
My concern is automated systems. YouTube videos get demonetized and cloud storage gets shut down because of automated copyright enforcement. They shut channels down and delete videos for the kinds of things I worry about, too.
This was not always the case. It might not be the case now that Russian companies scan for this stuff, but why risk it?