Today I found this in my log:
Jan 12 22:39:39 mail postfix/postscreen[17030]: COMMAND PIPELINING from 
[216.46.18.51]:58366 after QUIT

So I wondered -- "after QUIT?" and had a look at the client:

mail:~# host 216.46.18.51
51.18.46.216.in-addr.arpa is an alias for 51.32/27.18.46.216.in-addr.arpa.
51.32/27.18.46.216.in-addr.arpa domain name pointer mail51.parafat.org.

mail:~# telnet mail51.parafat.org. 25
Trying 216.46.27.98...
Connected to parafat.org.
Escape character is '^]'.
220 mail98.parafat.org ESMTP Postfix (Ubuntu)
QUIT
221 2.0.0 Bye
Connection closed by foreign host.

Would a Postfix instance trigger postscreen of another instance?

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebra...@charite.de | http://www.charite.de
            

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