"Post and Send" does what the customer's profile says. Set the profile and stop choosing every time.
Tell Me: Document Sending Profiles. A profile says: print (yes/no, prompt), email (yes, with attachment, prompt), disk (PDF), electronic document (via the e-document service, Peppol etc.). Make one the default; assign others to customers who differ (a customer who requires Peppol; one who still wants paper). Then Post and Send on an invoice does the right thing for that customer without a dialog. The email address and layout come from the customer's Document Layouts (tip 33).
With the e-document framework (version 23 onwards) the same profile is how electronic invoicing is switched on per customer when the regulations require it.
