OK, it turns out there is an incompatibility between the postfix package
in precise and the version of openssl in precise.
This was fixed in postfix 2.10.2 by the following change:
20130616
TLS Performance: the Postfix SMTP server TLS session cache
was ineffective because recent OpenSSL versions enable
session tickets by default, resulting in a different ticket
encryption key for each smtpd(8) process. The workaround
turns off session tickets. In 2.11 we'll enable session
tickets properly. Viktor Dukhovni. File: tls/tls_server.c.
This was causing the postfix server to respond in an invalid way,
resulting in the openssl security fix to trigger the error.
** Package changed: openssl (Ubuntu) => postfix (Ubuntu)
** Also affects: postfix (Ubuntu Precise)
Importance: Undecided
Status: New
** Changed in: postfix (Ubuntu)
Status: New => Fix Released
** Changed in: postfix (Ubuntu Precise)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1356843
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