• update to 3.0-20150719 (3.0.2)

20150501

Support for Linux 4.*, and some simplification for future
makedefs files. Files: makedefs, util/sys_defs.h.

20150718

Security: opportunistic TLS by default uses "medium" or
stronger ciphers instead of "export" or stronger. See the
RELEASE_NOTES file for how to get the old settings back.
Files: global/mail_params.h, proto/TLS_README.html,
proto/postconf.proto, and files derived from those.

20150719

Security: Postfix TLS support by default no longer uses
SSLv2 or SSLv3.  See the RELEASE_NOTES file for how to get
the old settings back. Files: global/mail_params.h,
proto/postconf.proto, and files derived from those.

Incompatible change with Postfix 2.11.6 / 3.0.2

As of the middle of 2015, all supported Postfix releases no longer
enable "export" grade ciphers for opportunistic TLS, and no longer
use the deprecated SSLv2 and SSLv3 protocols for mandatory or
opportunistic TLS.

These changes are very unlikely to cause problems with server-to-server
communication over the Internet, but they may result in interoperability
problems with ancient client or server implementations on internal
networks. To address this problem, you can revert the changes with:

Postfix SMTP client settings:

lmtp_tls_ciphers = export
smtp_tls_ciphers = export
lmtp_tls_protocols = !SSLv2
smtp_tls_protocols = !SSLv2
lmtp_tls_mandatory_protocols = !SSLv2
smtp_tls_mandatory_protocols = !SSLv2

Postfix SMTP server settings:

smtpd_tls_ciphers = export
smtpd_tls_protocols =
smtpd_tls_mandatory_protocols = !SSLv2

These settings, if put in main.cf, affect all Postfix SMTP client
or server communication, which may be undesirable. To be more
selective, use "-o name=value" parameter overrides on specific
services in master.cf. Execute the command "postfix reload" to make
the changes effective.