First, You need proper spelling, grammar, and punctuation or they won't know what you are talking about.
Second, You should be brief and to the point not to long because then they might just ignore it.
Third, You should not write in all caps it could be considered rude.
Fourth, Make it personal don't email random information the person might not answer back.
Fifth, Use smiley faces or any face just show emotion because what you say may confuse them on your emotion.
Sixth, Don't use texting words like lol or brb who you are talking to might not know what it means or your boss might fire you.