I am able to send email from my virtualmin installation but unable to receive email, below is the mail.log file data which is showing SASL authentication failure any idea what can be causing this
Aug 19 15:33:45 cbl postfix/smtpd[11975]: connect from sonic307-10.consmr.mail.ne1.yahoo.com[66.163.190.33]
Aug 19 15:33:45 cbl postfix/smtpd[11975]: warning: SASL authentication failure: Internal Error -4 in server.c near line 1757
Aug 19 15:33:45 cbl postfix/smtpd[11975]: warning: SASL authentication failure: Internal Error -4 in server.c near line 1757
Aug 19 15:33:45 cbl postfix/smtpd[11975]: warning: SASL authentication failure: Internal Error -4 in server.c near line 1757
Aug 19 15:33:45 cbl postfix/smtpd[11975]: warning: xsasl_cyrus_server_get_mechanism_list: no mechanism available
Aug 19 15:33:45 cbl postfix/smtpd[11975]: fatal: no SASL authentication mechanisms
Aug 19 15:33:46 cbl postfix/master[9431]: warning: process /usr/libexec/postfix/smtpd pid 11975 exit status 1
Aug 19 15:33:46 cbl postfix/master[9431]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling