The mailto protocol lets you create hyperlinks that will directly launch the default email software and compose a new email message. Mailto commands in Firefox even work with web mail programs like Gmail.
You probably know how to use the mailto command for quickly linking to one email address but the mailto syntax actually allows a lot more – you can address the same message to multiple addresses, populate the cc, bcc or subject fields, and even write text inside the email body.
Remember to use %20 for the space character and %0A to add a line break in the body text.
You can test any mailto command by directly typing the command in the browser’s address bar.
Master the mailto Syntax
Let’s assume you maintain the official Whitehouse website and need to create mailto links that will make it easy for visitors to reach the president via email.
1. Send an email to Barack Obama (single recipient)
2. Send an email to Barack and Michelle Obama (separate multiple recipients with a comma)
3. Send an email to Barack but put Michelle in the CC: list and Joe Biden in the BCC: list
4. Send an email to Barack Obama with the subject "Congrats Obama"
5. Send an email to Barack Obama with the subject "Congrats Obama" and some text in the body of the email message
You may use any permutations and combinations while writing a mailto hyperlink but make sure that there’s only one "?" character.