The best part about mailify is that it has all of my contacts' email address's which I can use to send bulk mails from time-to-time, so this really helps me out! Sending mass messages through an API isn't easy for people who are new at coding or don’t have much experience using APIs but if you do then there shouldn't be any problems as they provide detailed tutorials along their documentation page (which also includes examples).
They should improve some features like sending multiple files per message instead just one file only; maybe offer more than 1 language support too? It would help those users outside US/Canada etc., because most times when we try contacting them via chat feature they reply late due date expiry issue & sometimes not responding back to us even after reaching maximum number tries limit set by server admins -_-.