On 08/11/16 07:50, Mueller wrote:
>  Message 1c2Zcm-0007Qi-L7 has been frozen (message created with -f <>).
> The sender is <>.
> 
> The following address(es) have yet to be delivered:
>   [email protected] <[email protected]>: SMTP error from remote mail
> server after RCPT TO:<[email protected]>: host mail.tropenklinik.de
> [213.185.88.41]: 554 5.7.1 <[email protected]>: Relay access denied

Do not accept mail for recipients that are not yours.

> How can I discard this messages  or set up exim to refuse any null sender
> (senders= : )!?? So no one can send with , mail from :<>.

The sender is not the problem; the recipient is.  Configure to only
accept mail for your customers.
-- 
Jeremy


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