On which port are you trying to submit the message? Port 587? You likely are
> enforcing TLS on that port. > > my submitting port is set to 465. there are only 2 ports listening under Postfix process. 25 and 465 > In any case either change the smtpd_tls_policy_level to 'may' or configure > the > client failing to use STARTTLS. > my smtpd_tls_policy_level is already set to "may". can you please explain "or configure the client failing to use STARTTLS." sorry if you find my questions very beginner level i am very new and trying to learn. Thanks, Yousuf
