The following shortcode has been used to display the contacts who preferred to be contacted via email.
[contact_list filter="attr::emd_contact_pref::is::email;"]
ID First Name Last Name Email Phone Contact Preference Date
425d8cff06604b12 Mila Kunis test4@example.com (305) 781 4583 Email August 21, 2019
425d8cff06604b11 Brad Pitt test3@example.com (305) 781 4582 Email August 20, 2019
425d8cff06604b8 Dwyane Wade test@example.com (305) 781 4579 Email August 17, 2019