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Is it possible to send mail to other domain without ssl authentication?

we are using Postfix 2.11.3 on Ubuntu 15.10 Here is configuration file: smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append_dot_mydomain = no readme_directory = no ...
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Postfix canonical map for forwarding

Because of problems of IP/domain reputation (my server and domain very recent), I had to use Amazon SES as SMTP relay to be able to not have my mails flagged as spam. My setup with Amazon was working ...
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postfix server flooded with junk email to other users

I have just noticed my postfix (maillog) is being flooded with external emails to be sent to both local and external email servers.. As far as i am aware, i have turned off relaying for other ...
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disable SMTP relay/auth domains

I am using postfix 2.8.x, for some reason I want to disable SMTP relay/auth for some domains. I have studied from postfix page for configuration and I am guessing to use smtpd_relay_restrictions, ...