I don't think that it's the problem. My mail server is developed in C language and replies that I send to Postfix are strings. As I think you know, all strings in C are NULL terminated and there's no chance for create string that aren't NULL terminated. Moreover, as previously mentioned, my server works well with Mozilla Thunderbird. If <CR><LF><NULL> were the guilty, neither the first string ("220 myMailServer.localhost SMTP service ready") would arrive.

Il 11/04/2010 22:48, Wietse Venema ha scritto:
Emanuele:
Ok, I've attached tcp dump. It contains only 8 packets because after the
HELO message, as you can see from logfile previously posted, there's no more
communication.
Your server replies end in

        <CR><LF><NULL>

That is not SMTP compliant.

        Wietse

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