Problem with new installation

[Steve Matzura]

I am running a copy of configurations from a running version 2 
installation from Ubuntu 14.04, now alive as version 3 on Ubuntu 18.04.

I thought I'd be slick and port over all the user mailbox directories in 
/var/mail/vmail, all the customized .cf's, and the MySQL database. 
Everything ported over nicely, Postfix runs in backward compatibility 
mode, but for  every mail message, I get this in syslog:


Oct 22 18:51:36 tgvprod postfix/pickup[1114]: 852EB604E4: uid=1000 
from=<tgvpadmin>
Oct 22 18:51:36 tgvprod postfix/cleanup[2770]: warning: connect to 
Milter service inet:localhost:8891: Connection refused
Oct 22 18:51:36 tgvprod postfix/cleanup[2770]: warning: 
proxy:mysql:/etc/postfix/mysql_virtual_alias_maps.cf lookup error for 
"tgvpadmin@tgvprod"


or this:


Oct 22 18:54:08 tgvprod postfix/smtpd[3174]: connect from 
web01.groups.io[66.175.222.12]
Oct 22 18:54:09 tgvprod postfix/smtpd[3174]: NOQUEUE: reject: RCPT from 
web01.groups.io[66.175.222.12]: 451 4.3.0 
<bounce+24676+32560+11292+3239...@groups.io>: Temporary lookup failure; 
from=<bounce+24676+32560+11292+3239...@groups.io> 
to=<chris...@theglobalvoice.info> proto=ESMTP helo=<web01.groups.io>
Oct 22 18:54:09 tgvprod postfix/smtpd[3174]: lost connection after RCPT 
from web01.groups.io[66.175.222.12]
Oct 22 18:54:09 tgvprod postfix/smtpd[3174]: disconnect from 
web01.groups.io[66.175.222.12] ehlo=2 starttls=1 mail=1 rcpt=0/1 
commands=4/5

I'm thinking it's something common to both problems, but can't figure 
what. Any assistance gratefully appreciated.