update to 2.7.0. Excerpt from the release notes:
NEW FEATURES SUMMARY
- significant improvements affecting a pre-queue content filtering setup
(time limiting, warm/flying restart, ...) - requires Postfix 2.7.0 and
SpamAssassin 3.3.0, or later;
- new daemon amavisd-signer makes it possible to sign mail with DKIM
signatures without requiring amavisd process to have access to private
signing keys;
- added support for the Sophos-SSSP, Avira SAVAPI and ClamAV clamd streaming
protocols allows amavisd to communicate with these antivirus solutions;
- allow specifying multiple (fail-over) back-end mailers for resubmission
of messages from amavisd back to MTA;
- support for Postfix 2.8.0 XFORWARD IDENT, passes a local message identifier
(queue id) downstream to a post-queue content filter and back to Postfix;
- speedup in data transfer rate on receiving large mail via SMTP/LMTP
sessions by a factor of 3.9 for plain text sessions, and by a factor
of 11 for encrypted (TLS) sessions;
- recognize and insert header fields as prepared by SpamAssassin 3.3.0
or later through its 'add_header' configuration option;
- a new setting allows a forward_method to be chosen based on a message
content type and/or recipient address; this may be useful for outgoing
mail routing purposes or to implement sender reputation schemes;
- per-recipient (or per- policy bank) SpamAssassin configuration files or
SQL configuration sets are supported (@sa_userconf_maps), and per-recipient
SQL Bayes database usernames (@sa_username_maps);
- new macros: client_helo, client_addr, client_port, client_addr_port,
mime2utf8, rusage, ADDEDHEADERHAM, ADDEDHEADERSPAM, banned_parts_as_attr,
actions_performed, new arguments to macros dkim, header_field, HEADER,
YESNO and YESNOCAPS;
- @listen_sockets setting offers a unified configuration of listening
sockets; it may be configured directly, or the traditional way: the
$inet_socket_port, $unix_socketname and $inet_socket_bind just add their
entries to the @listen_sockets list;
- lists of lookup tables (the @*_maps variables) can now contain
explicit SQL and LDAP lookup objects as their elements, instead of
(or in addition to) the implied SQL and LDAP lookups;
- a new configuration variable @virus_name_to_policy_bank_maps allows
loading of policy banks based on a virus name;
- a new configuration variable $mail_id_size_bits allows setting the size
of randomly generated mail_id and secret_id codes;
- a new configuration variable $sql_store_info_for_all_msgs allows storing
information on mail messages selectively just for quarantined messages;
- added SNMP counters InMsgsStatus* which combine the final mail checking
status with a direction of a mail flow;
- optional transparent archival quarantine, retaining envelope recipient
addresses on delivery to a dedicated SMTP server;
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