after update if your outlook do not work on smtp port 587 make sure to change /etc/postfix/master.cf

from:
submission inet n – n – – smtpd -o smtpd_enforce_tls=yes -o smtpd_tls_security_level=encrypt …..
to:
submission inet n – n – – smtpd -o smtpd_enforce_tls=no -o smtpd_tls_security_level=may …..