Anti-Spam SMTP Proxy Server (ASSP)
ASSP is an open source, Perl based transparent SMTP proxy
server. The spam filter sits on port 25
(SMTP), and optionally also port 465 (SMTPS) and port 587 (Submission),
in front of a SMTP server.
ASSP relays the SMTP dialog between an incoming client and
your SMTP server, intercepting the dialog as needed. ASSP performs a
number of configurable spam checks and on detecting a spam message
provides an immediate 5xx SMTP error code back to the client. Non-spam
messages are passed to your regular SMTP serverfor further processing
and delivery. Spam messages can be blocked from delivery or
subject-tagged and delivered.
This software is easy to set up, requiring only minimal
changes to the configuration of the Mail Transfer Agent of the system.
ASSP 1.98
|
|
Price
Free to download
Size
1.3MB
License
GNU GPL
Developer
Fritz Borgstedt and others
Website
assp.sourceforge.net
System Requirements
Perl 5.8 or higher
Perl Modules:
Compress::Zlib, Digest::MD5
Digest::SHA1 Email::MIME, Email::MIME::Modifier
Email::Send, Email::Valid
File::ReadBackwards File::Scan::ClamAV IO::Socket::SSL, LWP::Simple
Mail::SPF
Mail::SRS Net::CIDR::Lite, Net::DNS Net::IP::Match::Regexp, Net::LDAP
Net::SMTP, Net::SenderBase Net::Syslog Sys::Syslog, Time::HiRes
Support
Sites:
Wiki,
Forums,
Mailing
Lists
Selected
Reviews:
Academia.edu
|
Features include:
- Easy browser-based setup
- Self learning Bayesian analysis which intelligently
classifies email into spam and non-spam
- Weighted Regular Expression Filtering
- Penalty Box (PB) trapping
- Realtime Blackhole Listing DNSBL/RBL
- URIBL (Uniform Resource Identifier Black Listing)
- Multi-level SPF (Sender Policy Framework) validation and
blocking
- SRS (Sender Rewriting Scheme) fix-up
- Session Delaying/Greylisting and connection response
delaying
- Automatic whitelist
- Sender validation and recipient validation (LDAP)
- Multi-level attachment blocking (based on block lists or
allow lists)
- Virus scanning (ClamAV and FileScan)
- Senderbase and multiple other filter methods
- Multiple RFC validation mechanisms
- Native SSL-support
- Multiple Weighted DNSBLs
- Multiple Weighted URIBLs
- Backscatter Detection
- Works with Sendmail, qmail, Postfix,
Imail, Hmailserver, Kerio, Exchange, Courier, Mercury, Lotus Notes, and
all other standard SMTP servers
- Uses honeypot type spambucket
addresses to automatically recognize spam and update your spam database
Return
to Anti-Spam Tools Home Page
Last Updated Sunday, April 07 2013 @ 09:58 AM EDT
| 
