Bob M

Yes, this fixed the problem. However on CentOS it's a different package. yum install gnupg2-smime Got it going for me!

Me too! OS: CentOS release 6.10 (Final) mysql: mysql Ver 8.0.19 for Linux on x86_64 (MySQL Community Server - GPL) (Runing Virtualmin as well) I don't see a way to set debug flags, etc. but I'm happy to help if asked to try things. I confirmed my mailserver is working; mail to root from cron jobs, etc. get delivered normally.