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servername:/etc/exim4# exim4 -bh xx.xx.xx.xxx

**** SMTP testing session as if from host xx.xx.xx.xxx
**** but without any ident (RFC 1413) callback.
**** This is not for real!

>>> host in hosts_connection_nolog? no (option unset)
>>> host in host_lookup? yes (matched "*")
>>> looking up host name for xx.xx.xx.xxx
>>> IP address lookup yielded host.domain.tld
>>> gethostbyname2 looked up these IP addresses:
>>>   name=host.domain.tld address=xx.xx.xx.xxx
>>> checking addresses for host.domain.tld
>>>   xx.xx.xx.xxx OK
>>> host in host_reject_connection? no (option unset)
>>> host in sender_unqualified_hosts? no (option unset)
>>> host in recipient_unqualified_hosts? no (option unset)
>>> host in helo_verify_hosts? no (option unset)
>>> host in helo_try_verify_hosts? no (option unset)
>>> host in helo_accept_junk_hosts? no (option unset)
220 host.domain.tld ESMTP Exim 4.50 Sun, 26 Nov 2006 11:19:18 +0100
ehlo host.domain.tld
>>> using ACL "acl_check_helo"
>>> processing "accept"
>>> check hosts = :
>>> host in ":"? no (end of list)
>>> accept: condition test failed
>>> processing "accept"
>>> check hosts = +relay_from_hosts
>>> gethostbyname2 looked up these IP addresses:
>>>   name=localhost address=127.0.0.1
>>> host in "localhost : 192.168.0.0/24 : xx.xx.xx.xxx"? yes (matched "xx.xx.xx.xxx")
>>> host in "+relay_from_hosts"? yes (matched "+relay_from_hosts")
>>> accept: condition test succeeded
>>> host in pipelining_advertise_hosts? yes (matched "*")
>>> host in auth_advertise_hosts? yes (matched "*")
>>> host in tls_advertise_hosts? yes (matched "*")
250-host.domain.tld Hello host.domain.tld [xx.xx.xx.xxx]
250-SIZE 52428800
250-PIPELINING
250-AUTH PLAIN LOGIN CRAM-MD5
250-STARTTLS
250 HELP
HELP
>>> host in smtp_accept_max_nonmail_hosts? yes (matched "*")
214-Commands supported:
214 AUTH STARTTLS HELO EHLO MAIL RCPT DATA NOOP QUIT RSET HELP
STARTTLS

( ab hier bleibt er dann stehen )

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LOG: SMTP connection from host.domain.tld [xx.xx.xx.xxx] closed after SIGTERM
421 host.domain.tld: Service not available - closing connection

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entropy=`cat /proc/sys/kernel/random/entropy_avail`

if [ $entropy -lt 1000 ]; then
  find /var/mail -type f -print0 | rl -0 -c 5000 | xargs -0 cat > /dev/null
fi