Recipients can be added in three ways:

• addTo(): Adds a recipient to the mail with a "To" header

• addCc(): Adds a recipient to the mail with a "Cc" header

• addBcc(): Adds a recipient to the mail not visible in the header.

getRecipients() serves list of the recipients. clearRecipients() clears the list.

Note: Additional parameter
addTo() and addCc() accept a second optional parameter that is used as a human-readable name of the recipient for the header. Double quotation is changed to single quotation and angle brackets to square brackets in the parameter.