Hey guys - we have a requirement whereby when we create an invoice (on save), then an email attaching the invoice PDF is emailed to custom email address field 2, custom email address field 3, custom email address field 4. As well as the standard email field in the customer record itself. Is this possible without scripting?

That’s an exactly good use for a Workflow.

Whats the best way to utilise workflow to achieve this?

a) Create a search that captures the Invoices you want to email. Hint, include a summary criteria to exclude Invoices that already have email messages. b) Create a Scheduled Workflow using the above search c) State - Action - Send Email, Apply your template and Attach PDF. d) test that your search in a) excludes the sent transactions.