[ajdude]

No OP, but I’m using mailinabox on a linode vps for $5/month. The IP is in a range that doesn’t typically get marked as spam by default, and there are several checkers in place on the admin console to make sure that you’re dotting all of your “i”s and crossing all of your “t”s, from MTA-STS to DNSSEC. I do still run into problems from time to time, but it’s very rare these days.

[tptacek]

Is there a documented reason to believe that DNSSEC is important, or really even at all influential, with deliverability? Most email origins, even the ones doing their own hosting, aren't DNSSEC-signed; if DNSSEC was a deliverability signal, most domains would be having problems.

[tyldum]

Mailgun and others also have a free tier for relaying smaller numbers of email.

I've configured Postfix to use it for fallback if I can't deliver directly.

I use Digital Ocean and seem to struggle a bit delivering directly. 60 emails this month had to be delivered through mailgun since direct failed. Their free tier is up to 1250 emails per month.