Hello, this is a "I have a problem with a client" report. This is *not* to say "hey, OpenSMTPd is doing something wrong!".
The client uses Microsofts .net System.Net.Mail class. OpenSMTPd ignores the "initial-response" in the AUTH LOGIN command. (Which is often used to save one round trip by supplying the username.) client: AUTH LOGIN username # username in base64 OpenSMTPd: Username: # in base64 OtherSMTPd: Password: # in base64 The lazy client then chooses to (incorrectly?) ignore the Username: challenge (and passes the Password!). I do not know (and I tried to find out via RFCs 4422+4954 plus www searching) what is the right behaviour. But since initial-response is optional I doubt one should rely on it. Opinions? (Or has this been discussed and I missed it?) There's this web page describing the problem: https://blogs.msdn.microsoft.com/akashb/2009/09/16/system-net-mail-unable-to-authenticate-against-some-third-party-smtp-servers/ Marcus -- You received this mail because you are subscribed to [email protected] To unsubscribe, send a mail to: [email protected]
