On 17/04/2015 1:02 pm, Krzs wrote: > :~$ telnet smtp.myFQDN 25 > Trying 1.2.3.4 ... > Connected to myFQDN. > Escape character is '^]'. > 220 smtp.myFQDN ESMTP Postfix > ehlo smtp.myFQDN > 250-smtp.myFQDN > 250-PIPELINING > 250-SIZE 10240000 > 250-ETRN > 250-STARTTLS > 250-ENHANCEDSTATUSCODES > 250-8BITMIME > 250 DSN > mail from: admin@myFQDN > 250 2.1.0 Ok > auth plain gibberishtextinbase64encodedvalueoftheusernameadminandpassword > 503 5.5.1 Error: authentication not enabled > Connection closed by foreign host.
I'm no expert, but it seems to me that you're trying to authenticate before setting up a TLS connection
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