Unable to sendmail via postfix on ubuntu server

I followed this tutorial: http://postfix.state-of-mind.de/patrick … rvers.html">http://postfix.state-of-mind.de/patrick.koetter/smtpauth/smtpauthmailservers.html

Upon postfix reload, I get this:

postfix: Postfix is running with backwards-compatible default settings

postfix: See http://www.postfix.org/COMPATIBILITY_README.html for details

postfix: To disable backwards compatibility use "postconf compatibility_level=2" and "postfix reload"

postfix/postfix-script: fatal: the Postfix mail system is not running

When I try to sendmail, I get this error:

postdrop: warning: unable to look up public/pickup: No such file or directory

I am trying to bypass my isp's port 25 block. I am running Ubuntu server 16.