Bounced message after update

[Michael A. Peters]

Hi -

Updated from 2.2.27 to 2.3.0

server is webmail (roundcube)

Sending worked before after update. Now it receives, but trying to send 
- this is the bounce in the log

Feb  9 01:37:45 {hostname} postfix/pipe[22891]: 931FD2577: 
to=<{user}@{hostname}.{tld}>, relay=dovecot, delay=0.01, delays=0/0/0/0, 
dsn=5.3.0, status=bounced (command line usage error. Command output: 
lda: Fatal: Invalid -f parameter: Missing domain )
Feb  9 01:37:45 deviant postfix/qmgr[16492]: 931FD2577: removed

{hostname}, {user}, {tld} are substitutions.

Here's my lda config:

protocol lda {
     log_path = /home/{hostname}/dovecot-deliver.log
     auth_socket_path = /var/run/dovecot/auth-master
     postmaster_address = postmaster@{hostname}.{tld}
}

Any suggestions (other than reverting) ?

This worked just before the update.

If it matters, Roundcube 1.3.4