And you don't have to build so many varieties

so you join the standard email field with a custom text field or only send out your emails to the custom text field? i.e. the standard email field on the customer is already populated with the primary email address but we have about 100 or so clients who have 1-2 extra cc addresses i need to add in addition to what’s already in the standard email field. Im not tied to the way im doing it currently just need something that works and allows me to customise the shoddy email that goes out with invoices at present that’s in plain text with no signature etc.

I use a secondary field.