The Art Of Pitch-Perfect Emails   Think about your subject line
One time my mom sent me an email with the subject, "Time to get
serious." I thought she was criticizing my life choices, but she
really just wanted to know what shoe size I wear. This was kind
of funny coming from my mom, but if you're sending emails to
coworkers and other official types, it's a good idea to make
your subject line actually correspond to the substance of your
email. Natasha Terk, president of Write It Well, told me,
You've got to think about a subject line like a headline for an
article [...] We encourage people to make them specific, make
them descriptive. We also encourage people to change the subject
line when the subject of your communication changes.  Her
examples of unhelpful subject lines: "proposal," "meeting," and
"hello." Better would be "the name of the meeting, the date,
your specific request." Terk adds, "choose words carefully."
Open wisely  It seems obvious, but it's worth a reminder: your
salutation says a lot a