Problems upgrading from 2.1.18 to 2.2.x

[Matt Singerman]

Hello,

I am trying to upgrade my version of Cyrus on a FreeBSD 6.0 machine. 
I was able to use the ports system to successfully upgrade, then
followed the instructions on Cyrus' webpage to update the database
structure and mailboxes.  I believe that that worked; however, when I
try to log into the mail server, I am prompted for my password, which
it cannot take.  Upon closer inspection of the logfile, it is saying
that the user is not found.  Is this because it is taking the full
user at domain as the username and I have not declared a default domain? 
How may I change this?

Below is the relevant log file:

Mar 28 07:29:49 list master[19738]: process started
Mar 28 07:29:49 list ctl_cyrusdb[19739]: recovering cyrus databases
Mar 28 07:29:49 list ctl_cyrusdb[19739]: skiplist: recovered /var/imap/mailboxes
.db (225 records, 17660 bytes) in 0 seconds
Mar 28 07:29:49 list ctl_cyrusdb[19739]: done recovering cyrus databases
Mar 28 07:29:50 list master[19738]: ready for work
Mar 28 07:29:50 list ctl_cyrusdb[19740]: checkpointing cyrus databases
Mar 28 07:29:50 list ctl_cyrusdb[19740]: done checkpointing cyrus databases
Mar 28 07:29:53 list imap[19741]: no user in db
Mar 28 07:29:53 list imap[19741]: no user in db
Mar 28 07:29:53 list imap[19741]: badlogin: pool-72-75-20-22.washdc.east.verizon
.net [72.75.20.22] plaintext msingerman at mchgroup.org SASL(-13): user not found:
checkpass failed
Mar 28 07:30:01 list imap[19741]: no user in db
Mar 28 07:30:01 list last message repeated 3 times
Mar 28 07:30:01 list imap[19741]: badlogin: pool-72-75-20-22.washdc.east.verizon
.net [72.75.20.22] plaintext msingerman at mchgroup.org SASL(-13): user not found:
checkpass failed

Thanks for all help.