In your previous mail you wrote:
People, have you been reading the posts? The stubby SMTP daemon is not
an SMTP server, it is simply a program that returns the following set of
responses TO ANYTHING THAT IS PASSED TO IT.
=> IMHO it should reject SMTP connection from the beginning with
the 521 greeting described in RFC 1846...
Regards
Francis(_dot_)Dupont(_at_)enst-bretagne(_dot_)fr