OpenSMTPD: How to debug - OpenBSD's smtpd failed to start
This post is about "smtpd -dv -Tlookup". I wrote about how to debug rcctl and find why an error occurs in OpenBSD last year. The "-d" option is still useful to me as well. But it's sometimes insufficient. It was when I used OpenSMTPD. Where there's a will, there's a way. smtpd.8 provides the way!
Tags: opensmtpd, mailserver, debug, letsencrypt