This is actually a really big and growing problem IMO. I gave up trying to run SMTP ourselves years (decades?) ago. Services like Sendgrid et al all made it ve

This is actually a really big and growing problem IMO. I gave up trying to run SMTP ourselves years (decades?) ago. Services like Sendgrid et al all made it very easy. However, in the last couple of years I've noticed even the basic paid plan on Sendgrid, Sparkpost, Mailgun (I've tried them all now I think?) still gets constantly blacklisted. Going to support gives you one answer: upgrade to a dedicated IP, which is close to $100/month, and really quite wasteful on the IPv4 space (if anyone knows a cheaper/better alternative, please let me know!). The problem is I am often building systems which require very little (but really important) email - the odd password reset request perhaps. For small webapps you're going to be spending probably more for this dedicated email IP than the rest of your infra combined.