The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

and may have left an unfortunate
voice MAIL for Stephen Hawking.
The Big Bang Theory Season 7, Episode 20

...you pretend you have problems
with voice MAIL...
The Big Bang Theory Season 2, Episode 10

Star Trek? My chain MAIL.
The Big Bang Theory Season 12, Episode 24

This came in the MAIL,
and I want you to have it.
The Big Bang Theory Season 7, Episode 2

In the meantime,
please forward my MAIL.
The Big Bang Theory Season 3, Episode 13