Hi, in my recent use of transactional email, I have come across the solution offered by Oracle (OCI).
I understand the questionings of many about Oracle, but let’s face it, for those who are starting projects, they offer some very generous options.
So, anyway. The option I want to recommend to you is Mail Delivery. It is a very simple service for sending e-mail. For me it helped to solve the messages that were always classified as SPAM.
Mail Delivery is part of the Always Free features offered by the company. In this model, you can send up to 3000 emails per month.
Anyway, it is an option to Mailgun or other transactional email services.
I can’t speak English. So I used Deepl for translate.