You can receive World of Swing e-mails either in TEXT or in HTML format. What's the difference?

E-mails in TEXT format are composed of plain text with no formattings The benefit is that those e-mails can be read with any e-mail client.

E-mails in HTML format can use formattings and therefore can be much more user-friendly and easier to read. The draw back with HTML e-mails is that some e-mail clients can't read them or don't read them correctly. If you chose HTML and e-mails you receive from World of Swing contain strange symbols switch to TEXT, please.
HTML e-mails can also include active content, which can be a security risk, if your e-mail client has a security hole or weak settings. World of Swing doesn't sent out HTML e-mails with active content on principle.