I'm working on my very first hackathon project and am super interested in the problem of whether engineers still find it challenging to get their transactional (event-driven as opposed to marketing) e-mails to arrive in users' inboxes rather than junk folders. I know modern ESPs like Sendgrid and Mailgun are helping to address this sort of thing but I feel they're far from perfect as I personally still find important messages from websites that I use will arrive in the Junk folder sometimes.<p>Would be incredibly grateful to hear your experiences with deliverability issues in 2020 in your apps.