In this case the error tells you everything you need to know.
Holger Seidenberg wrote:
This is a base 64 encoded string that says "Username:"
i have some problems with smtp_auth(), im using qmail-smtpd-auth-0.31
patch and get this error message
telnet localhost 25
220 cronus.it-gurus.org ESMTP
250-AUTH LOGIN CRAM-MD5 PLAIN
250-AUTH=LOGIN CRAM-MD5 PLAIN
You replied with plain text, which is wrong. You need to send the base64
encoded [EMAIL PROTECTED], then it'll send back a base64 encoded
string that says "Password:", to which you reply with the base64 encoded
password. Simply reading the smtp auth spec would tell you how each auth
method is expected to work.
501 malformed auth input (#5.5.4)
Hope that helps,