Ralf, here is another one for your list of Cisco PIX and ASA problems with inspection of a SMTP protocol (actually, parsing of a mail header section):
http://www.arschkrebs.de/postfix/postfix_cisco_pix_bugs.shtml CSCsy28792 SMTP session disconnects due to improper parsing of a DKIM header field by ASA Problem description: SMTP session is disconnected during DATA phase of a SMTP transaction for mail messages with a DKIM signature, where the start of a string "content-type" or "content-transfer-encoding" in a tag's value of an "h" tag of a DKIM signature happens to fall on a packet boundary at a start of a packet. The session is dropped with the next packet containing a Content-Type or Content-Transfer-Encoding header field. Platform: ASA5580-40 Cisco Adaptive Security Appliance Software Version 8.1(2)
