Found an email completely in binary, took quite a bit of time to input it into a translator.

01010100 00110010 00110101 01101010 01011010 01010011 01000010 00110001 01100011 01000111 0011001 01110101 01001001 01000111 01000101 01100111 01100010 01010111 01101100 01101011 01100010 01101101 01101100 01101110 01100001 01001000 01010001 01100111 01011010 01001000 01001010 01101100 01011001 01011000 01001010 00110101 01001100 01000011 01000010 00110011 01100001 01000111 01101100 01110011 01011010 01010011 01000010 01001010 01001001 01001000 01000010 01110110 01100010 01101101 01010010 01101100 01100011 01101101 01010110 01101011 01001100 01000011 01000010 00110011 01011010 01010111 01000110 01110010 01001001 01000111 01000110 01110101 01011010 01000011 01000010 00110011 01011010 01010111 01000110 01111001 01100101 01010011 01110111 01001011 01010100 00110011 01011010 01101100 01100011 01101001 01000010 01110100 01011001 01010111 00110101 00110101 01001001 01000111 01000101 01100111 01100011 01011000 01010110 01101000 01100001 01010111 00110101 00110000 01001001 01000111 01000110 01110101 01011010 01000011 01000010 01101010 01100100 01011000 01001010 01110000

And when translated I get this
T25jZSB1cG9uIGEgbWlkbmlnaHQgZHJlYXJlYXJ5LCB3aGlsZSBJIHBvbmRlcmVkLCB3ZWFrIGFuZCB3ZWFyeSwKT3ZlciBtYW55IGEgcXVhaW50IGFuZCBjdXJp

this is base64 encoded, and by decoding it you get

Once upon a midnight dreareary, while I pondered, weak and weary,
Over many a quaint and cur

01001001 01000011 01000001 01100111 01001001 01000101 01000110 01101111 01001100 01000011 01000010 01101011 01100001 01011000 01001110 00110000 01100001 01010111 00110101 01101010 01100100 01000111 01111000 00110101 01001001 01000101 01101011 01100111 01100011 01101101 01010110 01110100 01011010 01010111 00110001 01101001 01011010 01011000 01001001 01100111 01100001 01011000 01010001 01100111 01100100 00110010 01000110 01111010 01001001 01000111 01101100 01110101 01001001 01001000 01010010 01101111 01011010 01010011 01000010 01101001 01100010 01000111 01010110 01101000 01100001 01111001 01000010 01000101 01011010 01010111 01001110 01101100 01100010 01010111 01001010 01101100 01100011 01101010 01110011 01001011 01010001 01010111 00110101 01101011 01001001 01000111 01010110 01101000 01011001 00110010 01100111 01100111 01100011 00110010 01010110 01110111 01011001 01011000 01001010 01101000 01100100 01000111 01010101 01100111 01011010 01001000 01101100 01110000 01100010 01101101 01100011 01100111 01011010 01010111 00110001 01101001 01011010 01011000 01001001 01100111

translated into: ICAgIEFoLCBkaXN0aW5jdGx5IEkgcmVtZW1iZXIgaXQgd2FzIGluIHRoZSBibGVhayBEZWNlbWJlcjsKQW5kIGVhY2ggc2VwYXJhdGUgZHlpbmcgZW1iZXIg

which, again, is encoded in base64, and translates to:

Ah, distinctly I remember it was in the bleak December;
And each separate dying ember

So this section will contain passwords found to protected nodes in addresses as I find them, I'm not sure if they will stay the same across plays or not but these will hopefully be potential ones to use.
The Playground: Hanna (Clover's IRL name)
The playground 2: nJX7ae (find it inside game files, rename Password.jpg to Password.txt and read the file)
Customer Service: Shadows (answer to the riddle Sundrops are repeating)
Courier: 1324 (when you turn the lights on look up, you will see groups of orange lights: count the groups)
The Maze: Fibonacci (1-1-2-3-5-8... is a special number sequence)

Venom: Inside your apps menu there is an Audio app: using it play a distorted sound. However, if you play the sound backwards you get the developer? saying "Search for Wannacry on the internet" (wannacry was a pretty successful ransomware in real life). If you put it into intranet (button T) you will unlock the theme (thank you buboes for intranet hint)
Clover's theme: if you look at the official announcement trailer for the game

in the very last shot there is a text on the back of the screen. It reads "e1NlYXJjaEywcl9BbmdlbEZpcmVfT25UaGVJTnRyNG4zdH0=" which is, again, BASE64, so using an decoder you get "SearchLr_AngelFire_OnTheINtr4n3t". So, if put AngelFire in intranet (press T) you will unlock this theme (thank ほうき for this secret)