if the equipment, software, and/or connection used for your "personal" communication, belong to a third party you do not control, like your employer, your government (yeah, don't kid yourself), or an internet cafe in Beijing, YOU SHOULD REALISTICALLY HAVE NO EXPECTATIONS OF PRIVACY WHATSOEVER.

many of these platforms are possibly infested with one or more of the following:

[1] monitoring/compliance software

[2] RDP or similar remote admin software

[3] trojan or other spyware/malware

any of which may also be open to someone else's exploits. the transiting communication will likely pass through other devices, which are also monitored (at&t, Verizon, etc.) and/or exploitable (Cisco, Microsoft, Apple, etc.). snooping IT people are the least of your problems, and i speak as a senior "IT person". the only times i've ever viewed someone else's emails or files, was when my boss or the HR director were staring over my shoulder, pointing to what they wanted to see. not that this isn't WIDE OPEN to abuse (it most definitely is), but there are SO many other reasons you should not trust the stuff provided by others, be it a mainframe, a UNIX laptop, or a mobile phone.

legal or not, moral or not, anyone who trusts connections under someone else's control, is a fool or worse; moreover, if one wants to keep something hidden, one should never commit it (unencrypted) to ANY medium, including print, audio recording, photography or film (though steganography and one-time cyphers are still adequately secure).

old Russian saying:

don't think.

if you think, don't speak.

if you speak, do not write it down.

if you write it down, do not sign your name.

if you sign your name, do not be surprised at what happens after.