main.cf:
#Stock config part from the distribution

compatibility_level = 2
queue_directory = /var/spool/postfix
command_directory = /usr/local/sbin
daemon_directory = /usr/local/libexec/postfix
data_directory = /var/db/postfix
mail_owner = postfix
unknown_local_recipient_reject_code = 550
mynetworks_style = host
debugger_command =
	 PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
	 ddd $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/local/sbin/sendmail
newaliases_path = /usr/local/bin/newaliases
mailq_path = /usr/local/bin/mailq
setgid_group = maildrop
html_directory = /usr/local/share/doc/postfix
manpage_directory = /usr/local/man
sample_directory = /usr/local/etc/postfix
readme_directory = /usr/local/share/doc/postfix
inet_protocols = ipv4
meta_directory = /usr/local/libexec/postfix
shlib_directory = /usr/local/lib/postfix

# Added config

virtual_mailbox_domains = aqq.is
#virtual_mailbox_maps = hash:/usr/local/etc/postfix/virtualmailboxes
#virtual_alias_maps = hash:/usr/local/etc/postfix/virtualaliasmaps
#virtual_mailbox_base = /var/mail/vhosts
relay_recipient_maps = hash:/usr/local/etc/postfix/virtualmailboxes

virtual_transport = lmtp:unix:private/dovecot-lmtp

virtualmailboxes:
test@aqq.is testmail
some@aqq.is testmail2
nomail@aqq.is testmail

Log:
Mar 11 19:59:01 aquila postfix/smtpd[3676]: connect from unknown[192.168.1.13]
Mar 11 19:59:01 aquila postfix/smtpd[3676]: 6611850880: client=unknown[192.168.1.13]
Mar 11 19:59:01 aquila postfix/cleanup[3680]: 6611850880: message-id=<C33398F0-3E9A-47E6-B92A-B7FDEB5F0034@fatcat.ru>
Mar 11 19:59:01 aquila postfix/qmgr[3669]: 6611850880: from=<5555@aquila.testbox.com>, size=499, nrcpt=1 (queue active)
Mar 11 19:59:01 aquila dovecot: lmtp(3683): Connect from local
Mar 11 19:59:01 aquila dovecot: auth-worker(3684): passwd(some@aqq.is): unknown user
Mar 11 19:59:01 aquila dovecot: auth: passwd-file(some@aqq.is): unknown user
Mar 11 19:59:01 aquila dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=192.168.1.13, lip=192.168.1.200, TLS handshaking: Disconnected, session=<qdUv8SVn7OfAqAEN>
Mar 11 19:59:01 aquila postfix/lmtp[3681]: 6611850880: to=<some@aqq.is>, relay=aquila.testbox.com[private/dovecot-lmtp], delay=0.04, delays=0.01/0.01/0.01/0.01, dsn=5.1.1, status=bounced (host aquila.testbox.com[private/dovecot-lmtp] said: 550 5.1.1 <some@aqq.is> User doesn't exist: some@aqq.is (in reply to RCPT TO command))
Mar 11 19:59:01 aquila dovecot: lmtp(3683): Disconnect from local: Successful quit
Mar 11 19:59:01 aquila postfix/cleanup[3680]: 6E18350882: message-id=<20180311165901.6E18350882@aquila.testbox.com>
Mar 11 19:59:01 aquila postfix/bounce[3685]: 6611850880: sender non-delivery notification: 6E18350882
Mar 11 19:59:01 aquila postfix/qmgr[3669]: 6E18350882: from=<>, size=2560, nrcpt=1 (queue active)
Mar 11 19:59:01 aquila postfix/qmgr[3669]: 6611850880: removed
Mar 11 19:59:01 aquila postfix/local[3687]: 6E18350882: to=<5555@aquila.testbox.com>, relay=local, delay=0.01, delays=0/0.01/0/0, dsn=5.1.1, status=bounced (unknown user: "5555")
Mar 11 19:59:01 aquila postfix/qmgr[3669]: 6E18350882: removed
Mar 11 19:59:01 aquila dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=192.168.1.13, lip=192.168.1.200, TLS handshaking: Disconnected, session=<eCow8SVn7efAqAEN>