private String getMail(Person person) {
   if (person.hasInstitutionalEmailAddress()) {
     return person.getInstitutionalEmailAddressValue();
   } else {
     String emailForSendingEmails = person.getEmailForSendingEmails();
     return emailForSendingEmails != null ? emailForSendingEmails : StringUtils.EMPTY;
   }
 }