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.
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.