At the moment, if the recipient field in the mail client contains a contact with two different email addresses, only the primary address is used for the reply.

It is required that all recipients are part of the "reply all recipient list" and no e-mail address is removed.

If the user chooses the option "reply all", all recipients of the original e-mail should be included for the reply.

This is especially important for contacts with two different e-mail addresses (e.g. contact with a business e-mail and/or external e-mail).