Tips on how to write effective emails:

Do not overcommunicate by email
Ask yourself if the email is necessary for the written record, too personal, will avoid back-and-forth communication, or if it would take less time to communicate over the phone or in person.
Make good use of subject lines
Summarise the email content, grab readers attention and include any reply time frames required.
Keep messages clear and brief
The email body should be direct and informative, and it should contain all pertinent information (a shortlist using bullet points or numbers can help with this). You should include any further details in an attached document or zip file, or a hyperlink to the location of resources.
Be polite
The emails you send formally reflect your professionalism, values and attention to detail.
Check your tone
Write in a formal tone as your choice of words, sentence length, punctuation and capitalisation can easily be misinterpreted without visual and auditory cues. A formal tone requires little to no inclusion of jargon.
Proofread
Take a moment to review your email for spelling, grammar, and punctuation mistakes, the length and tone of the message, and to ensure it is addressed to the correct email address.
Review email etiquette
See when to use BCC vs CC.