Fix SMTPD_USERS sasl authentication broken by drift in postfix chroot…

… configuration

Fix typos and grammar in Readme

Fix dockerfile linting issue

Reset myhostname to avoid build server rDNS being used, add some note…

…s and info when fixing spool dir

Merge pull request #49 from panubo/upgrade_debian12

Upgrade to debian 12 and add postfix_exporter

Migrate to Quay.io and ECR

Allow setting CLIENT_TLS_CA, unify smtpd CApath with client default

add TLS target to makefile

Add disable_vrfy_command option support (#44)

* Add disable_vrfy_command option support

Increment year