Rainloop - Can't connect to server

Hi,

Since yesterday, My Rainloop - Can’t connect to server when login.

How to debug & fixing. Any idea for help me. Thanks

My EMAIL LOGS
Sep 1 03:54:53 TokyoHF_5 postfix/smtpd[156512]: warning: SASL: Connect to private/auth failed: Connection refused
Sep 1 03:54:53 TokyoHF_5 postfix/smtpd[156512]: fatal: no SASL authentication mechanisms
Sep 1 03:54:54 TokyoHF_5 postfix/master[95682]: warning: process /usr/libexec/postfix/smtpd pid 156512 exit status 1
Sep 1 03:54:54 TokyoHF_5 postfix/master[95682]: warning: /usr/libexec/postfix/smtpd: bad command startup – throttling
Sep 1 03:55:38 TokyoHF_5 postfix/smtps/smtpd[156517]: connect from unknown[20.52.57.245]
Sep 1 03:55:38 TokyoHF_5 postfix/smtps/smtpd[156517]: warning: SASL: Connect to private/auth failed: Connection refused
Sep 1 03:55:38 TokyoHF_5 postfix/smtps/smtpd[156517]: fatal: no SASL authentication mechanisms
Sep 1 03:55:39 TokyoHF_5 postfix/master[95682]: warning: process /usr/libexec/postfix/smtpd pid 156517 exit status 1
Sep 1 03:55:39 TokyoHF_5 postfix/master[95682]: warning: /usr/libexec/postfix/smtpd: bad command startup – throttling
Sep 1 03:56:34 TokyoHF_5 postfix/anvil[156513]: statistics: max connection rate 1/60s for (smtp:212.70.149.4) at Sep 1 03:54:53
Sep 1 03:56:34 TokyoHF_5 postfix/anvil[156513]: statistics: max connection count 1 for (smtp:212.70.149.4) at Sep 1 03:54:53
Sep 1 03:56:34 TokyoHF_5 postfix/anvil[156513]: statistics: max cache size 1 at Sep 1 03:54:53
Sep 1 03:57:13 TokyoHF_5 postfix/smtps/smtpd[156530]: connect from unknown[20.52.57.245]