Error 535 Authentication failed when using AuthPla (wodSmtpServer / wodPop3Server / wodImapServer)

Hi,

I am writing an email server by using C# at the moment but I am having a problem when I use Plain Authentication.

The email client that I am using can support LOGIN, NTLM, CRAM MD5, PLAIN and MSN authentications.

On my code, I have used:-

Smtp.Authentication = SmtpAuthentications.AuthPlain;

and there is a method called 'Smtp_Authenticate' that is used to valid the username and password and decide the action.

Once I am using PLAIN authentication from this email client, I will have an error 535 Authentication failed displayed on the client. When I set a break point within my code, my server will not process the 'Smtp_Authenticate' method at all. It stops at another method called 'Smtp_Command'.

If I use User.Transcript property within this 'Smtp_Command' method, I will get the followings:-

User 127.0.0.1 issued command EHLO ABC
250-ABC Hello ABC [127.0.0.1], nice to meet you
250-EXPN
250-HELP
250-AUTH PLAIN
250-PIPELINING
250 8BITMIME
AUTH PLAIN

Would you please tell me what is happening at there? and how to solve this?

Thanks,
Yan.

Yan,

hi. Does client send only

AUTH PLAIN

or it sends data following AUTH PLAIN too, such as

AUTH PLAIN dGVzdAB0ZXN0AHRFc3Q0Mg==

By specification it should send also login/pass details, but I don't see it from the Transcript you provided. wodSmtpServer will not fire event (and will return error to the client) if details are missing.

Kreso