David Mehler:
> Hello,
> 
> I am still trying to get this email sending with autodiscover working.
> I've temporarily put Thunderbird aside as it looks like it has a long
> standing compatibility issue with sending commands to early, and have
> switched to outlook 2010. With it I am getting the following which I
> do not know what unknown is.
> 
> Apr 21 04:22:38 hostname postfix/submission/smtpd[44179]: connect from
> Connecting-Host-and-IP
> Apr 21 04:22:39 hostname postfix/submission/smtpd[44179]: lost
> connection after UNKNOWN from Connection-hostname-ip

Please do not remove crucial evidence. 

I suppose that you still have

    Apr 20 14:37:00 hostname postfix/submission/smtpd[92360]:
    improper command pipelining after EHLO from
    Connecting-Machine-Hostname-And-IP: QUIT\r\n.

If you don't have this, what did you do to change the client's
behavior?

I suppose that you also have:

    disconnect from hostname[address] ehlo=1...

What is the complete set of logfile records?

        Wietse

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