It is better to use several channels at once italy whatsapp to promote your program, taking into account the peculiarities of distribution and perception of information.
customer loyalty programs

Email distribution usually covers the entire subscriber base, and you can start with the most active clients who are able to participate in the further distribution of advertising information on their own initiative.
Social media
Social networks are a wide audience, which, however, needs to be hooked by the uniqueness or advantage of the new offer. Here you should briefly and clearly describe the advantages of the program, inviting everyone to join it. Also, the presentation of the material should be adapted to the specifics of the audience of certain social networks - for example, users of Odnoklassniki and VKontakte are somewhat different. Thanks to social media, your clientele can be replenished with new people.