Aug  8 13:48:33 vps191267 dovecot: imap-login: Disconnected: Too many invalid commands (no auth attempts in 57 secs): user=<>, rip=188.175.155.118, lip=5.135.147.5, session=<kU3/VMsczAC8r5t2>
Aug  8 13:48:52 vps191267 dovecot: auth-worker(16650): mysql(localhost): Connected to database dbispconfig
Aug  8 13:48:52 vps191267 dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?2492858369?16648?1?267a629bebc2e583c3dd1c16f0bbe4d6
Aug  8 13:48:52 vps191267 dovecot: pop3: Error: Authentication server didn't send valid SPID as expected: MECH  PLAIN   plaintext
Aug  8 13:48:52 vps191267 dovecot: pop3: Error: Disconnected from auth server, aborting (client-pid=16648 client-id=1)
Aug  8 13:48:52 vps191267 dovecot: pop3-login: Internal login failure (pid=16648 id=1) (internal failure, 1 succesful auths): user=<kozusnik@inovestudio.com>, method=PLAIN, rip=188.175.155.118, lip=5.135.147.5, mpid=16651, TLS, session=<X6AcVsscFgC8r5t2>
Aug  8 13:48:52 vps191267 dovecot: auth: Warning: auth client 16648 disconnected with 1 pending requests: EOF
Aug  8 13:48:52 vps191267 dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?3822977025?16652?1?b44d33a06c31a87042d6fd62ead367eb
Aug  8 13:48:52 vps191267 dovecot: pop3: Error: Authentication server didn't send valid SPID as expected: MECH  PLAIN   plaintext
Aug  8 13:48:52 vps191267 dovecot: pop3: Error: Disconnected from auth server, aborting (client-pid=16652 client-id=1)
Aug  8 13:48:52 vps191267 dovecot: pop3-login: Internal login failure (pid=16652 id=1) (internal failure, 1 succesful auths): user=<kozusnik@inovestudio.com>, method=PLAIN, rip=188.175.155.118, lip=5.135.147.5, mpid=16653, TLS, session=<jiYiVsscFwC8r5t2>
Aug  8 13:48:52 vps191267 dovecot: auth: Warning: auth client 16652 disconnected with 1 pending requests: EOF
Aug  8 13:48:52 vps191267 dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?3522297857?16654?1?c451433874707f84a4507c06f1baa0b0
Aug  8 13:48:52 vps191267 dovecot: pop3: Error: Authentication server didn't send valid SPID as expected: MECH  PLAIN   plaintext
Aug  8 13:48:52 vps191267 dovecot: pop3: Error: Disconnected from auth server, aborting (client-pid=16654 client-id=1)
Aug  8 13:48:52 vps191267 dovecot: pop3-login: Internal login failure (pid=16654 id=1) (internal failure, 1 succesful auths): user=<kozusnik@inovestudio.com>, method=LOGIN, rip=188.175.155.118, lip=5.135.147.5, mpid=16655, TLS, session=<mWknVsscGAC8r5t2>
Aug  8 13:48:52 vps191267 dovecot: auth: Warning: auth client 16654 disconnected with 1 pending requests: EOF
Aug  8 13:48:53 vps191267 dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?688128001?16656?1?7cdc3d5f20c3a059dd83f3536b8741a3
Aug  8 13:48:53 vps191267 dovecot: pop3: Error: Authentication server didn't send valid SPID as expected: MECH  PLAIN   plaintext
Aug  8 13:48:53 vps191267 dovecot: pop3: Error: Disconnected from auth server, aborting (client-pid=16656 client-id=1)
Aug  8 13:48:53 vps191267 dovecot: pop3-login: Internal login failure (pid=16656 id=1) (internal failure, 1 succesful auths): user=<kozusnik@inovestudio.com>, method=LOGIN, rip=188.175.155.118, lip=5.135.147.5, mpid=16658, TLS, session=<xnssVsscGQC8r5t2>
Aug  8 13:48:53 vps191267 dovecot: auth: Warning: auth client 16656 disconnected with 1 pending requests: EOF
Aug  8 13:48:53 vps191267 dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?2325348353?16659?1?867f8b63203996bc42ef07ce4b9e07b3
Aug  8 13:48:53 vps191267 dovecot: pop3: Error: Authentication server didn't send valid SPID as expected: MECH  PLAIN   plaintext
Aug  8 13:48:53 vps191267 dovecot: pop3: Error: Disconnected from auth server, aborting (client-pid=16659 client-id=1)
Aug  8 13:48:53 vps191267 dovecot: pop3-login: Internal login failure (pid=16659 id=1) (internal failure, 1 succesful auths): user=<kozusnik@inovestudio.com>, method=PLAIN, rip=188.175.155.118, lip=5.135.147.5, mpid=16660, TLS, session=<toQ1VsscGgC8r5t2>
Aug  8 13:48:53 vps191267 dovecot: auth: Warning: auth client 16659 disconnected with 1 pending requests: EOF