Email Etiquette:

Email etiquette refers to a set of dos and don’ts that are recommended by business and communication experts to use email effectively or appropriately. Email etiquette offers some guidelines that all writers can use to facilitate better communication between themselves and their readers.

Few tips for writing better Emails:
The email subject should be detailed enough to give the recipient an idea about the email content without having to open it.
Be concise and to the point
Try to avoid abbreviations and field-specific jargon so that your recipient may understand you.
Never use capital letters while typing and email message to anyone. For starters, caps are considered impolite and resemble shouting in speech.
Avoid long sentences
Keep your language gender neutral
Use active instead of passive
Do not write an email while you are in a really bad mood. It would reflect on the style of your writing.
Do not use email to discuss confidential information
Do not overuse Reply to All
Always reply to emails especially the ones specifically addressed to you. The sender is still waiting to hear from you.
Always do spell check to your email prior to sending it to be sure that the message sent is free of grammatical, vocabulary and appropriate usage errors.
If you have to email more than two documents as attachments, zip them in one file. Doing so would ensure that your recipient won't miss downloading any file.
Do not request a Read Notification Receipt.