On 3/4/23 06:37, Carlos E. R. wrote:
On 2023-03-04 12:01, Per Jessen wrote:
Carlos E. R. wrote:
I am confused about why the need to configure for "NTLM and GSSAPI" as you say. I don't configure for any, I just let postfix figure it out on its own.
You must have a very special postfix :-) There is no way postfix is going to automagically figure out how to submit mails on port 587, set up TLS, authenticate etc.
Kind of. I configured it once years ago, a decade ago at least, but I never had to worry about what protocols it does. It negotiates what to use with the other end, AFAIK.
But my mail providers do not seem to require kerberos.
For port 587 and TLS, you need to tweak /etc/postfix/master.cf and enable -o smtpd_tls_security_level=encrypt -o smtpd_sasl_auth_enable=yes -- David C. Rankin, J.D.,P.E.