It is possible to decide which address to use for mass mailing.
The user has a choice between the three following options:
1 / Always use by default the BP address or the address of the BPs associated with a contact.
2 / Always use the contact address.
3 / Use the BP address only if the contact address is empty.
If the user ticks the "By Business Partner" box, choice 1 will be executed. In this case, the "BP address on empty Contact address" is grayed out because it is of no logical use.
If the user ticks the "By contact" box and does not tick the "BP address on empty Contact address" box, then choice 2 will be executed.
If the user ticks the "By contact" box and the "BP address on empty Contact address" box, then choice 3 will be executed.