Oct 03 20:19:52 auth: Error: net_connect_unix(auth-worker) in directory /run/dovecot failed: Permission denied (euid=5000(vmail) egid=5000(vmail) missing +r perm: /run/dovecot/auth-worker, dir owned by 0:0 mode=0755)
I set this about an hour ago, then applied some security patches and restarted
Files and directories inside of /run/ are created every time you reboot the server. If you manually change the owner or permissions it will only stay that way until next reboot. You have to edit config settings for the service in question for how you want those directories / files created on reboot. I do not know how to do that in ubuntu but in RHEL you edit (or create) config files in /etc/tmpfiles.d/
Package installed default on RHEL /usr/lib/tmpfiles.d/dovecot.conf "d /var/run/dovecot 0755 root dovecot -"
Not sure what you are trying to do, but another option might be give user vmail dovecot group access so vmail can access files with a dovecot group read permission. usermod -a -G dovecot vmail