Philip Bondi writes:
[818] # journalctl -n 3000|grep postfi|grep "Apr 07 14:13" Apr 07 14:13:27 shackleton12 postfix/qmgr[3240968]: 88A222D6E: from=<pjbondi@systemdatabase.com>, size=2009, nrcpt=1 (queue active) Apr 07 14:13:27 shackleton12 postfix/qmgr[3240968]: warning: connect to transport private/lmtp: Connection refused
As Mark suggests, the entry for virtual_mailbox_recipients should be deleted (but I'm doubtful that will help because I see no entry for virtual_mailbox_domains). If that doesn't help, look at Postfix's master.cf. Check for entries referring to lmtp and 9024.
-- GNU Mailman consultant (installation, migration, customization) Sirus Open Source https://www.siriusopensource.com/ Software systems consulting in Europe, North America, and Japan