Smtp port 587 not working

after upgrading from 10.5.2 to 10.5.4 we are no longer able to use port 587 for smtp... only port 25 no SSL works.
we have followed the suggestions in the the below posts....
http://discussions.apple.com/thread.jspa?messageID=7291740&#7291740
(recommenting smtps inet n - n - - smtpd in /etc/postfix/master.cf to enable smtp to run in the first place)
http://discussions.apple.com/thread.jspa?messageID=7513032&#7513032
(enabling port 587 in /etc/postfix/master.cf)
we are also getting the following warnings in mail.log
Jul 19 14:04:07 xserve postfix/smtpd[5658]: warning: connect to private/tlsmgr: No such file or directory
Jul 19 14:04:08: --- last message repeated 1 time ---
Jul 19 14:04:08 xserve postfix/smtpd[5658]: warning: problem talking to server private/tlsmgr: No such file or directory
Jul 19 14:04:08 xserve postfix/smtpd[5658]: warning: no entropy for TLS key generation: disabling TLS support
however not sure if that is really related - as we are only using SSL certificates not requiring... so presumably smtp should still work?
any help appreciated.

btw. if we do a telnet test, it first establishes a connection but then we get the following instantly:
"Connection closed by foreign host."
also checked that the firewall is configured correctly and lets traffic on port 587 in...
ds.

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