On Tue, 18 Aug 2020 at 11:29, Leonardo Rodrigues <leolis...@solutti.com.br> wrote: > > > Hello Everyone, > > Trying to enable smtp_tls_* on my server for allowing emails > delivery to the world using TLS (not smtpd_tls_*, those are working just > fine for years). > > While i could get it working fine, i'm afraid that some wrongly > configured servers, that offers TLS but have some problem on that, > cannot receive my emails. I have configured smtp_tls_* to accept as low > as TLSv1, but i'm afraid that even that might brake some deliveries. > > Question: is there some parameter to allow smtp daemons to, > somehow, fallback to non-TLS deliveries after, for example, N number of > delivery tries or N seconds, for example? I have already searched on > TLS_README.html but couldn't find anything like that. (running postfix > 3.5.4)
smtp_tls_security_level = may This is 'opportunistic TLS'. Normally you should not need to (and should not) change any other smtp_tls_* settings from their defaults.
