The manual for auth-optional looks like this: If auth-optional is specified, then SMTPAUTH is not required to establish an SMTP transaction. This is only useful to let a listener accept incoming mail from untrusted senders and outgoing mail from authenticated users in situations where it is not possible to listen on the submission port.
What is submission port? I noticed, that if option "auth" is specified, than nobody can send messages to my server without password, even gmail or other external services. If option auth-optional is specified, i successfully receive mail from gmail, yandex and everything else. So, I think auth-optional is the only choise for most of servers, am i right? I'm very happy using OpenSMTPD! This is the best MTA ever! Could you help me with one more question, please. Will OpenSMTPD ever support non-tls PLAIN login auth mechanism? For me it is not a problem to use tls, but some old or thin mua does not support tls or ssl, i know this is not secure, but for the OpenSMTPD full greatness it would be nice. Thank you for all! -- You received this mail because you are subscribed to [email protected] To unsubscribe, send a mail to: [email protected]
