# 503 5.5.1 Error: authentication not enabled **URL:** \ **Category:** SUSE Linux Enterprise Server\ **Created:** [May 19, 2023, 12:42am UTC](https://forums.suse.com/t/503-5-5-1-error-authentication-not-enabled/40712 "2023-05-19T00:42:15Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![wenchengkao](https://avatars.discourse-cdn.com/v4/letter/w/bbe5ce/32.png) [@wenchengkao](https://forums.suse.com/u/wenchengkao)\ **Post date:** [May 19, 2023, 12:42am UTC](https://forums.suse.com/t/503-5-5-1-error-authentication-not-enabled/40712/1 "2023-05-19T00:42:16Z")
HI All I refer opensuse document about postfix > **[Mail server HOWTO - openSUSE Wiki](https://en.opensuse.org/Mail_server_HOWTO)** # I have enable imaps and SMTP/SMTPS I could use doveadm auth login “linux local username” “password” to auth success. like blow doveadm auth login user01 password passdb: user01 auth succeeded extra fields: user=user01 userdb extra fields: user01 system\_groups\_user=user01 uid=1000 gid=100 home=/home/user01 auth\_mech=PLAIN ========================== but then I try to test SMTP to auth user by “telnet localhost 25” then type “ehlo localhost” it show message like below: Trying ::1… Connected to localhost. Escape character is ‘^]’. 220 smtp145.apulse.com.tw ESMTP ehlo localhost 250-smtp145.apulse.com.tw 250-PIPELINING 250-SIZE 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-DSN 250-SMTPUTF8 250 CHUNKING I type “AUTH LOGIN” to try to auth user. but it show “503 5.5.1 Error: authentication not enabled” Who could kindly provide suggestion to me ? Thanks!! Wencheng ---
**Author:** ![wenchengkao](https://avatars.discourse-cdn.com/v4/letter/w/bbe5ce/32.png) [@wenchengkao](https://forums.suse.com/u/wenchengkao)\ **Post date:** [May 19, 2023, 12:43am UTC](https://forums.suse.com/t/503-5-5-1-error-authentication-not-enabled/40712/2 "2023-05-19T00:43:38Z")
# these sasl parameters is my main.cf smtpd\_recipient\_restrictions = permit\_sasl\_authenticated, permit\_mynetworks, reject\_invalid\_helo\_hostname, reject\_non\_fqdn\_sender, reject\_unknown\_sender\_domain, reject\_non\_fqdn\_recipient, reject\_unknown\_recipient\_domain, reject\_unauth\_destination, reject\_rbl\_client [zen.spamhaus.org](http://zen.spamhaus.org), permit smtp\_sasl\_auth\_enable = no smtp\_sasl\_security\_options = smtp\_sasl\_password\_maps = smtpd\_sasl\_auth\_enable = no smtpd\_sasl\_type = dovecot smtpd\_sasl\_path = private/auth smtpd\_sasl\_local\_domain = $myhostname ========================== Whether which parameter I miss configure to enable SMTP authentication?? P.S: about "smtp\_sasl\_auth\_enable " , I had tested to set “Yes”, then restat postfix…but got the same result.