An email can be sent in three formats. The receiver’s email application must support the format in which you are sending emails.
1) Rich text format: This is the text only format where an email is sent as a text. It includes text formatting, alignment and bullets. Documents which use this format are also known as RTF documents.
2) HTML format: In this type of email formatting, HTML tags are used. All the HTML components like bullets, styles, backgrounds, hyperlinks are used. It is sent using the MIME protocol.
3) MIME (Multipurpose Internet Mail Extensions) format: MIME format is used to handle attachments in an email. It supports text, graphics, pictures, video, sound, etc. IN MIME format messages are sent out as both text and HTML. Depending on the email client of the recipient, the email is displayed accordingly. These settings can be configured in the email client.