I have a strange problem. I configured the line "-o smtpd_sasl_security_options=noanonymous,noplaintext" in /etc/postfix/master.cf file and then restarted it. Then I tried telnet connection to test that this setting is working: telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 server.example.com ESMTP Postfix (Ubuntu) ehlo server.example.com 250-server.example.com 250-PIPELINING 250-SIZE 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH PLAIN LOGIN CRAM-MD5 250-AUTH=PLAIN LOGIN CRAM-MD5 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN As you see - bolded lines - this config line not works. But after paste it to /etc/postfix/main.cf file I've got this: telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 server.example.com ESMTP Postfix (Ubuntu) ehlo server.example.com 250-server.example.com 250-PIPELINING 250-SIZE 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH CRAM-MD5 #here no plaintext 250-AUTH=CRAM-MD5 #here no plaintext 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN So that means that master.cf file is corrupted or something? I have few more config options in master.cf but now I am not sure they work: -o smtpd_sasl_tls_security_options=noanonymous,noplaintext #for smtps and submission part for smtps: -o syslog_name=postfix/smtps -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes -o smtpd_client_restrictions=permit_sasl_authenticated,reject part for submission: -o syslog_name=postfix/submission -o smtpd_tls_security_level=encrypt -o smtpd_sasl_auth_enable=yes -o smtpd_client_restrictions=permit_sasl_authenticated,reject
