On Tue, Feb 26, 2013 at 01:50:34AM +0100, Piotr Rotter wrote:
> Can I set postfix to reject empty sender address for authenticated users.

Null-sender must be accepted. There are several occasions where a MUA
may send them, for example DSN mandates its usage sometimes.

RFC 6409 specifies:
| Note that a null return path, that is, MAIL FROM:<>, is permitted and
| MUST NOT, in itself, be cause for rejecting a message.  (MUAs need to
| generate null return-path messages for a variety of reasons, including
| disposition notifications.)

Bastian

-- 
Peace was the way.
                -- Kirk, "The City on the Edge of Forever", stardate unknown

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