Adds an e-mail address to the contact's list of e-mail addresses and increments its reference count.
Note that only one e-mail address per contact may be marked as "primary". Insertion and update operations (with insert_contact) will return an error if more than one e-mail address is marked as primary.
Duplicate e-mail addresses will not be added to the list.
| this | |
| email_address |
a GDEmailAddress to add |