[exim] Prevent / refuse Mail from : <> null sender in exim

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Author: Mueller
Date:  
To: exim-users
Subject: [exim] Prevent / refuse Mail from : <> null sender in exim
Hello to all,

My exim version:

exim -bV
Exim version 4.72 #1 built 10-Oct-2014 09:23:33
Copyright (c) University of Cambridge, 1995 - 2007
Berkeley DB: Berkeley DB 4.7.25: (September 9, 2013)
Support for: crypteq iconv() IPv6 PAM Perl Expand_dlfunc TCPwrappers OpenSSL
Content_Scanning DKIM Old_Demime
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmnz
dnsdb dsearch ldap ldapdn ldapm nis nis0 nisplus passwd sqlite
Authenticators: cram_md5 cyrus_sasl dovecot plaintext spa
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore/mbx autoreply lmtp pipe smtp
Fixed never_users: 0
Size of off_t: 8
OpenSSL compile-time version: OpenSSL 1.0.1e-fips 11 Feb 2013
OpenSSL runtime version: OpenSSL 1.0.1e-fips 11 Feb 2013
Configuration file is /etc/exim/exim.conf




we have a problem with null sender mails. The mails getting started with
spams comming in, and just result in relay access denied:

Message 1c2Zcm-0007Qi-L7 has been frozen (message created with -f <>).
The sender is <>.

The following address(es) have yet to be delivered:
schulzanne@??? <schulzanne@???>: SMTP error from remote mail
server after RCPT TO:<schulzanne@???>: host mail.tropenklinik.de
[213.185.88.41]: 554 5.7.1 <schulzanne@???>: Relay access denied

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

Greetings
Daniel




EDV Daniel Müller

Leitung EDV
Tropenklinik Paul-Lechler-Krankenhaus
Paul-Lechler-Str. 24
72076 Tübingen
Tel.: 07071/206-463, Fax: 07071/206-499
Email: mueller@???
www.tropenklinik.de
www.bauen-sie-mit.tropenklinik.de