On 26 Apr 2017, at 20:41, Osman ÇAKMAR via Exim-users <[email protected]> 
wrote:
> The "F = <>" section is empty.

This is by design, and completely normal behaviour.

MTA software is usually configured in such a way that it will not respond to 
the null envelope sender “<>”. This prevents autoresponders autoresponding to 
autoresponders, or “autoresponder wars”.

Those of us who have been around email for a long time have seen these things 
happen for a variety of reasons, most of which revolve around poor decision 
making by the writer of a piece of software or the configuration for it.

If your gateway rejects all messages with a null envelope sender, how do you 
expect to accept bounces from external hosts?

Graeme
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