I try to use dovecot as a MTA with postfix.

But it does not accept incoming mails.

Why does it not work?

/var/log/maillog

Aug 14 11:03:32 localhost dovecot[566097]: lmtp(566373): Connect from local
Aug 14 11:03:32 localhost dovecot[566097]: lmtp(bruno@2c2axxx.online-server.cloud)<566373><0O+4HWRTNl9lpAgA0J78UA>: Debug: auth-master: userdb lookup(bruno@2c2axxx.online-server.cloud): Started userdb lookup
Aug 14 11:03:32 localhost dovecot[566097]: lmtp(bruno@2c2axxx.online-server.cloud)<566373><0O+4HWRTNl9lpAgA0J78UA>: Debug: auth-master: conn unix:/var/run/dovecot/auth-userdb: Connecting
Aug 14 11:03:32 localhost dovecot[566097]: lmtp(bruno@2c2axxx.online-server.cloud)<566373><0O+4HWRTNl9lpAgA0J78UA>: Debug: auth-master: conn unix:/var/run/dovecot/auth-userdb: Client connected (fd=16)
Aug 14 11:03:32 localhost dovecot[566097]: auth: Debug: master in: USER#0111#011bruno@2c2axxx.online-server.cloud#011service=lmtp
Aug 14 11:03:32 localhost dovecot[566097]: auth: Debug: passwd(bruno@2c2axxx.online-server.cloud): Performing userdb lookup
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: Loading modules from directory: /usr/lib64/dovecot/auth
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: Module loaded: /usr/lib64/dovecot/auth/lib20_auth_var_expand_crypt.so
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: Module loaded: /usr/lib64/dovecot/auth/libdriver_sqlite.so
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: passwd-file /etc/dovecot/users: Read 4 users in 0 secs
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: conn unix:auth-worker (pid=566367,uid=97): Server accepted connection (fd=14)
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: conn unix:auth-worker (pid=566367,uid=97): Sending version handshake
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: conn unix:auth-worker (pid=566367,uid=97): auth-worker<1>: Handling USER request
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: passwd(bruno@2c2axxx.online-server.cloud): Performing userdb lookup
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: passwd(bruno@2c2axxx.online-server.cloud): lookup
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): passwd(bruno@2c2axxx.online-server.cloud): unknown user  - trying the next userdb
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: passwd(bruno@2c2axxx.online-server.cloud): Finished userdb lookup
Aug 14 11:03:32 localhost dovecot[566097]: auth-worker(566374): Debug: conn unix:auth-worker (pid=566367,uid=97): auth-worker<1>: Finished
Aug 14 11:03:32 localhost dovecot[566097]: auth: Debug: passwd(bruno@2c2axxx.online-server.cloud): Finished userdb lookup
Aug 14 11:03:32 localhost dovecot[566097]: auth: Debug: passwd-file(bruno@2c2axxx.online-server.cloud): Performing userdb lookup
Aug 14 11:03:32 localhost dovecot[566097]: auth: Debug: passwd-file(bruno@2c2axxx.online-server.cloud): lookup: user=bruno@2c2axxx.online-server.cloud file=/etc/dovecot/users
Aug 14 11:03:32 localhost dovecot[566097]: auth: passwd-file(bruno@2c2axxx.online-server.cloud): unknown user
Aug 14 11:03:32 localhost dovecot[566097]: auth: Debug: passwd-file(bruno@2c2axxx.online-server.cloud): Finished userdb lookup
Aug 14 11:03:32 localhost dovecot[566097]: auth: Debug: userdb out: NOTFOUND#0111
Aug 14 11:03:32 localhost dovecot[566097]: lmtp(bruno@2c2axxx.online-server.cloud)<566373><0O+4HWRTNl9lpAgA0J78UA>: Debug: auth-master: userdb lookup(bruno@2c2axxx.online-server.cloud): auth USER input:
Aug 14 11:03:32 localhost dovecot[566097]: lmtp(bruno@2c2axxx.online-server.cloud)<566373><0O+4HWRTNl9lpAgA0J78UA>: Debug: auth-master: userdb lookup(bruno@2c2axxx.online-server.cloud): Userdb lookup failed
Aug 14 11:03:32 localhost postfix/lmtp[566372]: 4E2127802973: to=<bruno@2c2axxx.online-server.cloud>, relay=2c2axxx.online-server.cloud[private/dovecot-lmtp], delay=0.26, delays=0.19/0.02/0.02/0.02, dsn=5.1.1, status=bounced (host 2c2axxx.online-server.cloud[private/dovecot-lmtp] said: 550 5.1.1 <bruno@2c2axxx.online-server.cloud> User doesn't exist: bruno@2c2axxx.online-server.cloud (in reply to RCPT TO command))

[root@localhost bruno]# cat /etc/dovecot/users

#user:password:uid:gid:(gecos):home:(shell):extra_fields
bruno:{CRAM-MD5}88XXXee:5001:5001::/home/bruno::
mail:{CRAM-MD5}88XXXee:5001:5001::/home/mail::
nas:{CRAM-MD5}8eXXX40:5001:5001::/home/nas
asys:{CRAM-MD5}99XXX09:5001:5001::/home/asys