Currently we do not log in the communications log of emails, the From email address. The To, CC, BCC and Author are logged, but not the From address. Since it is quite possible (and normal) for a practice location to have multiple email addresses recorded (and thus multiple possible From addresses for an email) we should log the From address. Thus we will be able to ascertain both who sent the email (ie the Author) and the actual From address used.
We will need to change both the code and the act.customerCommunicationEmail archetype.
No migration is needed because it is impossible to obtain the From addressee from the log of previous emails.