| Info: | Read the documentation hosted at readthedocs. |
|---|---|
| Author: | Daniel Waardal |
DNSBL checking SMTP-Proxy
FU is a simple yet powerful SMTP Proxy that checks the incoming connections against a list of preconfigured DNSBL’s. Based on the weights assigned to the lists and a threshhold it makes a decision weather it should proxy the email to the upstream or hang up (close) the connection.
FU is optimized to run in a virtual machine environment. It should be able to handle a couple of hundred incoming connections per second on a single core system/vm.
Options accepted by the fu command.
| -h, --help | Show a help message and exit. |
| -c, --config | Configuration file. |
| -t, --test | A IPv4-address to run a test against based on the provided configuration file. |
settings:
loglevel: notice
predicate: 2
threshhold: 1.0
bind:
localhost: 2525
upstream:
- localhost: 1026
- localhost: 1025
providers:
bl.spamcop.net: {weight: 0.3}
ix.dnsbl.manitu.net: {weight: 1.0}
rhsbl.ahbl.org: {weight: 0.3}
truncate.gbudb.net: {weight: 1.0}
zen.spamhaus.org: {weight: 0.5}
$fu --config /etc/fu.yml --test 201.8.3.1
Negative response from 1.3.8.201.ix.dnsbl.manitu.net.
Negative response from 1.3.8.201.truncate.gbudb.net.
Negative response from 1.3.8.201.rhsbl.ahbl.org.
DNSBL reply: 11 (Predicate is: 2).
Positive response from zen.spamhaus.org adding 0.5 to weight
Negative response from 1.3.8.201.bl.spamcop.net.
0.5 is below the threshhold (1.0) - NOT SPAM!
FU is dependent on gevent to harness the power of libevent.
A one-liner to install on a fresh system.
sudo apt-get update; sudo apt-get install python-pip python-gevent python-yaml; sudo pip install fu
You then need to create the configuration file.