The Postfix mail logs may indicate the following error when emails are not working:

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

It turns out to be sendmail running along with Postfix and creating issues. The fix is to stop/remove sendmail and create the necessary postfix directory and restart the postfix service.

    # /etc/init.d/sendmail stop 
    #  mkfifo /var/spool/postfix/public/pickup
     # /etc/init.d/postfix restart

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