Some supplementary information on the new SMTP/LMTP client code,
which didn't make it into release notes included with a package
(but is now included in the on-line version or release notes):
- drop the use of libnet (modules Net::SMTP and Net::Cmd), replaced by own
code to implement client-side SMTP and LMTP protocol support, with a full
support for pipelining and IPv6. Some of my issues with Net::SMTP go
back to year 2002, but the one that broke camel's back is a 2.5+ months
status quo in not fixing a serious misfeature introduced in 1.20, which
mangles 8-bit characters in mail, causing a series of support questions,
and even affected some larger service providers without them realizing
there is a problem. Here are some relevant bug reports:
http://rt.cpan.org/Public/Bug/Display.html?id=24835
http://rt.cpan.org/Public/Bug/Display.html?id=2608
http://rt.cpan.org/Public/Bug/Display.html?id=2607
http://rt.cpan.org/Public/Bug/Display.html?id=14875
http://rt.cpan.org/Public/Bug/Display.html?id=9394
- as mentioned above, the new SMTP/LMTP client code now supports a LMTP
protocol too. This allows amavisd-new to act as a LMTP-to-LMTP content
filter, possibly being inserted between MTA and a LMTP-based mail delivery
agent such as Cyrus (if checking of outgoing mail is not needed). LMTP is
selected when the first field of a $*_method (such as $forward_method,
$notify_method, $resend_method, $release_method, $*_quarantine_method)
is a 'lmtp:'.
Possible uses:
$forward_method = 'lmtp:/var/imap/socket/lmtp'; # over a Unix socket
or:
$forward_method = 'lmtp:[127.0.0.1]:24'; # over IPv4
or:
$forward_method = 'lmtp:[::1]:24'; # over IPv6
If a Postfix lmtp service is used to feed amavisd (instead of the more
usual content filter feed through service named 'amavisfeed' or
'smtp-amavis'), make sure not to forget to limit the number of concurrent
feeds to amavisd (e.g. lmtp_destination_concurrency_limit=15) to a value
same (or less) than $max_servers, or limit the maxproc field in master.cf
such as: 'lmtp unix - - n - 15 lmtp' .
Note that placing amavisd as a LMTP delivery agent has a disadvantage
that outgoing mail is not being checked, so infected internal hosts are
able to pollute the world. Also the pen pals feature is no longer useful,
as it requires the information on previous outgoing mail to be present
in a SQL database.
Btw, as it became usual, I'll be away for the next two weeks starting
tomorrow. Fear not, there are already a couple of sites (including ours)
that are successfully running 2.5.0 (or its recent pre-released versions).
:-)
Mark
-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
AMaViS-user mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/amavis-user
AMaViS-FAQ:http://www.amavis.org/amavis-faq.php3
AMaViS-HowTos:http://www.amavis.org/howto/
