Free milter virus software for linux

Milter-virus is not a virus scanner. It is a wrapper that can be used with many commercial and freely available virus scanners. Milter-Virust is written completely in C, and requires (few skills??).
It is run-able with the Milter interface, but then will only scan for "double extensions".
If you wish it to scan for more, you need at Ripmime or other tools to extract files from MIME-encoded emails. You also need a (command-line) virus scanner.
The difference between this program and the original is that this is much more configurable via the config file. The original version has the advantage that it is simpler and easier to bugfix.
Enhancements:
- This is a large update.
- Many problems in the statistik module were fixed.
- Some spam protection features were included.

spfmilter provides a Sender Policy Framework (SPF) milter for Sendmail.
spfmilter is a milter (sendmail mail filter) which implements the Sender Policy Framework (SPF). SPF is a strategy for preventing junk mail. The SMTP standard for email allows anyone to forge anyone elses email address.
SPF verifies that the Sender address of an email message matches (according to some policy) the client IP address that submitted it.
The idea of SPF is to prevent email forgery. Each participating site sets up a little definition of which hosts are allowed to send mail claiming to be from that site. When another site receives mail, it checks the permitted-senders definition for the originating site. If the check fails, the mail is rejected.
Setting up the permitted-senders definition is very easy, you go to the SPF Wizard and fill out a little form, then put the resulting string into your DNS records. This milter implements the second half of SPF, checking the mail you receive against other sites SPF records.
Enhancements:
- Some improvements to the redhat rcscripts. (Paul Howarth)
- Deal with the unknown-family connections which occasionally show up on some OSs, such as Solaris. (Joel Lord)

The Qmail virus scanner (QScan) is a mail filter for Qmail that scans incoming messages using the Sophos Antivirus engine, immediately rejecting infected content.

It is designed to be minimalistic, yet extremely fast and secure, and uses multiple pipes instead of the traditional temporary files and privilege separation. It works with non-native versions of the virus scanner like under OpenBSD with Linux or FreeBSD emulation.


You must create a temporary directory to extract MIME attachments, and replace Qmails original qmail-queue program with Qscan. Quick way to achieve this for the impatients :

mkdir /var/qmail/qscan
chmod 700 /var/qmail/qscan
chown qmaild:qmail /var/qmail/qscan
ln /var/qmail/bin/qmail-queue /var/qmail/bin/qmail-queue-old

Now, lets compile and install Qscan :

./configure --help

./configure [your beloved flags]

make install-strip

The last step is to replace the original qmail-queue program with our filter :

rm /var/qmail/bin/qmail-queue
ln -s /usr/local/sbin/qscan /var/qmail/bin/qmail-queue

Depending on your local configuration, it may be needed or not, but start with doing it :

chown qmaild:qmail /usr/local/sbin/qscan
chmod 6711 /usr/local/sbin/qscan

After testing, if everythings ok for you, remove the setuid bit :

chown 0:0 /usr/local/sbin/qscan
chmod 711 /usr/local/sbin/qscan

IVS Milter provides a virus, spam, and content filtering milter.
IVS Milter is a virus, spam, and content milter. It makes use of the antivirus package ClamAV, and can also seamlessly integrate SpamAssassin (either spamc or libspamc).
IVS Milter is also plugin based and currently supports virus scanning, spam scanning, content-type matching, attachment type matching, and attachment filename matching.
Whats New in 1.0.7 Stable Release:
- Pointer NULL reference fixed
- Fixed bug where glib was generating CRITICAL messages
- Documentation update
- Implemented SIGUSR1 to dynamically reload configuration file
- Added support to reload directories of configuration files
- Fixed possible segfault when no configuration file
Whats New in 2.0.0 Pre7 Development Release:
- Spamassassin 3.0 support added, although there have been reports of memory leaks when using the ENHANCED libspamc method, best to specify to have the scan forked and run instead of library call for now
- Added thresholds so we can learn about spam, especially if you add your own rules you can force say everything over 100 to be learnt as spam
- Fixed support for limiting how many children we can spawn, this now works!
- Various bug fixes and small changes
- Fixed a bug where clamav only checked first file of attachment for virus

Python milter module provides a python interface to Sendmails libmilter that exploits all its features. Milters can run on the same machine as sendmail, or another machine.
The milter can even run with a different operating system or processor than sendmail. Sendmail talks to the milter via a local or internet socket, and keeps the milter informed of events as it processes a mail connection.
At any point, the milter can cut the conversation short by telling sendmail to ACCEPT, REJECT, or DISCARD the message. After receiving a complete message from sendmail, the milter can again REJECT or DISCARD it, but it can also ACCEPT it with changes to the headers or body.
Enhancements:
- The spf module has been moved to the pyspf package.
- This will cause some confusion when upgrading, since 0.8.6 still has the module and will conflict with pyspf, whereas 0.8.7 does not have spf by itself, and will stop doing SPF if you dont install pyspf.

Sendmail::Milter is a Perl interface to sendmails Mail Filter API.

SYNOPSIS

use Sendmail::Milter;

my %my_milter_callbacks =
(
connect => &my_connect_callback,
helo => &my_helo_callback,
envfrom => &my_envfrom_callback,
envrcpt => &my_envrcpt_callback,
header => &my_header_callback,
eoh => &my_eoh_callback,
body => &my_body_callback,
eom => &my_eom_callback,
abort => &my_abort_callback,
close => &my_close_callback,
);

sub my_connect_callback;
sub my_helo_callback;
sub my_envfrom_callback;
sub my_envrcpt_callback;
sub my_header_callback;
sub my_eoh_callback;
sub my_body_callback;
sub my_eom_callback;
sub my_abort_callback;
sub my_close_callback;


BEGIN:
{
# Get myfilters connection information
# from /etc/mail/sendmail.cf

Sendmail::Milter::auto_setconn("myfilter");
Sendmail::Milter::register("myfilter",
%my_milter_callbacks, SMFI_CURR_ACTS);

Sendmail::Milter::main();

# Never reaches here, callbacks are called from Milter.
}

Sendmail::Milter is a Perl extension to sendmails Mail Filter API (Milter).

Note: You need to have a Perl 5.6 or later interpreter built with -Dusethreads.

SMC non-context E-mail filter - is an software application designed to significantly reduce the amount of SPAM/UCE (junk-mail) you receive. SMC uses a dynamic local and DNS based remote "whitelists" (for known/trusted senders), DNS based "blacklists" (for undesired senders), and an original "autoauthentication" system (for unknown, but legitimate senders).
In additional SMC has a set of useful features which allows to preserve mail recipients from dangerous message attachments, HTML includes. SMC is an Sendmail milter (plugin), which stops the junk-mail without receiving one.
SMC uses 3 original algorithms, one of which is "Check relay by NS" simulates a dynamical whitelist and will always accept the messages from mail systems satisfying to following conditions:
1. Mail domain name (the host part of the senders e-mail address) must have an MX records;
2. Mail domain name and the connection host address must be resolved;
3. Connection host must be listed at the one of nameservers which hold the senders mail domain name.
The second from the developed algorithms is a "check delays" algorithm which is based on statistical check of delivery delays, generated by a [tempfail] return code, that allows to exclude a direct receiving of a mail, which not passed through the standard mail server.
NOTE: Using this feature the delivery of the mail from unknown, but legitimate senders will be delayed for a count of 10-minutes checks, which setted by the "maxcount" configuration parameter.
And the third of original algorithms is "auto-authentication" algorithm: The sender of a "mail contact" (sender-recipient pair) means as authenticated (whitelisted) if the filters statistics module has registered the both of a sended forward (request) and a recieved backward (reply) messages of this contact. The messages from the such authenticated senders will never be delayed by the previous "check delay" algorithm.
Enhancements:
- CLOSE_WAIT problems have been solved (a critical bug).
- There is a critical bugfix to prevent DNS storms.
- All of the resolver functions use the local resolver context.
- Automake and autoconf support have been added.

Aegis project is a virus scanner for Linux, Unix and Windows with a simple and intuitive user interface.

Aegis supports scanning of subdirectories, hidden files and .zip and .tar archive files, and drag-and-drop of files from the Nautilus file browser, or your Gnome desktop. When a virus is detected you can choose to delete, quarantine or rename the file.