Excellent Transactional Mail Options

I now use Sendgrid via WP Mail and could not be happier. I am assured that mail has a lower spam count, transactional emails arrive perfectly in the Inbox, and as I tend to stay under 100 a day, my costs are low. WP Mail allows not just SMTP but API setups, which are recommended by Sendgrid as the best practice. I choose PHP due to WordPress of course, but don’t have to do any fancy coding, just input the API key. Brilliant! Thank you for your excellent work.