In 2002 the European Union (EU) introduced the Directive on Privacy and Electronic Communications. Article 13 of the Directive prohibits the use of personal email addresses for marketing purposes. The Directive establishes the opt-in regime, where unsolicited emails may be sent only with prior agreement of the recipient; this does not apply to business email addresses.
GoDaddy Email Marketing provides great statistics to show you how many people are opening, engaging with and sharing your email. There’s no mystery or guesswork. You can even compare different emails side-by-side to quickly see which emails get the best response. Once you know what appeals to your readers, you can refine your emails for even better results.