I go around my isp blocking port 25 and use port 587.
Need to set it up in postfix master.cf.
smtps inet n - n - - smtpd -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes
587 inet n - n - - mtpd -o smtpd_enforce_tls=yes -o smtpd_sasl_auth_enable=yes
bob
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