Free smtp. software for linux

hermes is an SMTP proxy. We developed hermes for our own use on ITEISA, and we have perfected it with new features to cover our own needs. It is now being made public on the hope that it will help others to stop spam the same way it does for us everyday.
What makes it special is that it can be used to stop spam using a combination of the following techniques:
SMTP banner delay
Most spammers will start sending data as soon as the connection is open, without waiting for the SMTP banner. What we do is delay this banner and if we have data waiting before we print it, we drop the connection.
Throttling
hermes will process incoming SMTP commands at a slow pace. Most spammers have very little patience, so they will stop sending an email if its taking too long to deliver.
Greylisting
Greylisting is a process that will delay incoming mails for some minutes before allowing them to be delivered. As most spammers will not resend their messages, you will not receive them. If you want a more technical description, scroll down to read a greylisting description.
You can configure how this techniques work in the configuration file and you can even disable/enable them at will.
Enhancements:
- This release fixes a remotely exploitable bug on versions 1.3 to 1.5.
- Apart from this, no new features have been added or code changed.
- Everyone is encouraged to update as soon as possible.

SubEthaSMTP is an easy to understand Java library that provides a receptive SMTP server component.
By plugging this component into your Java application, you can easily receive SMTP mail using a simple abstract Java interface.
Also included is a small sub-project called Wiser, an easy to use incoming mail testing framework.
Main features:
- A mailing list manager (ie, SubEtha Mail)
- A mail server that delivers mail to user inboxes
- A mail archiver like Mail Archive
- An email test harness (Implemented in this project. Its called Wiser.)
SubEthaSMTP was split out of the SubEtha Mail mailing list manager because it is a useful standalone component. When we wrote SubEtha, the last thing we wanted to do was write our own SMTP server. In our search for a modular Java SMTP component, we examined:
Apache JAMES
JBoss Mail Server
Dumbster
Jsmtpd
JES
Java Mail Server
Since youre reading this page you probably already know what we found: Six different SMTP implementations without the slightest thought given to reusability. Even Jstmpd, which purports to be a "A Modular Java SMTP Daemon", isnt. Furthermore, even though JBoss Mail is in active development, the team was unintersted in componentization of the SMTP processing portion of their server.
During the development of SubEthas testing harness, we tried out the Dumbster software and found that not only was the API difficult to use, it did it not work properly, the developer has not done any development on it in about a year and it does not work reliably on Mac OS X. With two simple classes we re-implemented it as an included project called Wiser.
We hate reinventing wheels. This should be the LAST FREAKING JAVA SMTP IMPLEMENTATION.
Enhancements:
- This release fixes a couple of bugs with SMTP RFC handling.

POE::Component::Client::SMTP is a Perl module for asynchronous mail sending with POE. Thus your program isnt blocking while busy talking with an (E)SMTP server.

SYNOPSIS

Warning! The following examples are not complete programs, and arent designed to be run as full blown applications. Their purpose is to quickly introduce you to the module.

For complete examples, check the eg directory that can be found in the distributions kit.

A simple example:

# load PoCoClient::SMTP
use POE::Component::Client::SMTP;
# spawn a session
POE::Component::Client::SMTP->send(
From => foo@baz.com,
To => john@doe.net,
Server => relay.mailer.net,
SMTP_Success => callback_event_for_success,
SMTP_Failure => callback_event_for_failure,
);
# and you are all set ;-)
A more complex example:
# load PoCoClient::SMTP
use POE::Component::Client::SMTP;
# spawn a session
POE::Component::Client::SMTP->send(
# Email related parameters
From => foo@baz.com,
To => [
john@doe.net,
andy@zzz.org,
peter@z.net,
george@g.com,
],
Body => $email_body, # heres where your message is stored
Server => relay.mailer.net,
Timeout => 100, # 100 seconds before timeouting
# POE related parameters
Alias => pococlsmtpX,
SMTP_Success => callback_event_for_success,
SMTP_Failure => callback_event_for_failure,
);
# and you are all set

QmailToaster project is an RPM-based Qmail distribution for CentOS, Fedora, SuSE, and Mandriva. This system is designed for ease of deployment and includes strong anti-spam systems. This includes support for SRS, SPF, DomainKeys, and virtual hosting on the SMTP side. On the user side, this has a Web-based administration interface and supports POP3, POP3 over SSL, IMAP, and IMAP over SSL
Main features:
- Source RPM packages ready for RPM based distributions
- SMTP with SMTP-AUTH, TLS, REMOTE-AUTH
- DomainKeys, SPF "Sender Policy Framework" and SRS "Sender Rewriting Scheme"
- Integrated SpamAssassin, ClamAV and Simscan
- Warlord virus and worm loader realtime scanning
- CHKUSER 2.0 functions for qmail-smtpd
- Qmail-Tap provides email archive capability
- Virtual Domains (MySQL), Virtual Users (MySQL)
- Autoresponder, Mailing List
- Web-based email system, Web-based administration tools
- POP3, POP3-SSL, IMAP and IMAP-SSL
Enhancements:
- CentOS 5.x support was added.

Net::SMTP::TLS is an SMTP client supporting TLS and AUTH.

SYNOPSIS

use Net::SMTP::TLS;
my $mailer = new Net::SMTP::TLS(
your.mail.host,
Hello => some.host.name,
Port => 25, #redundant
User => emailguy,
Password=> s3cr3t);
$mailer->mail(emailguy@your.mail.host);
$mailer->to(someonecool@somewhere.else);
$mailer->data;
$mailer->datasend("Sent thru TLS!");
$mailer->dataend;
$mailer->quit;

Net::SMTP::TLS is a TLS and AUTH capable SMTP client which offers an interface that users will find familiar from Net::SMTP. Net::SMTP::TLS implements a subset of the methods provided by that module, but certainly not (yet) a complete mirror image of that API.

The methods supported by Net::SMTP::TLS are used in the above example. Though self explanatory for the most part, please see the perldoc for Net::SMTP if you are unclear.

The differences in the methods provided are as follows:
The mail method does not take the options list taken by Net::SMTP
The to method also does not take options, and is the only method available to set the recipient (unlike the many synonyms provided by Net::SMTP).
The constructor takes a limited number of Net::SMTPs parameters. The constructor for Net::SMTP::TLS takes the following (in addition to the hostname of the mail server, which must be the first parameter and is not explicitly named):

NoTLS - In the unlikely event that you need to use this class to perform non-TLS SMTP (you ought to be using Net::SMTP itself for that...), this will turn off TLS when supplied with a true value. This will most often cause an error related to authentication when used on a server that requires TLS
Hello - hostname used in the EHLO command
Port - port to connect to the SMTP service (defaults to 25)
Timeout - Timeout for inital socket connection (defaults to 5, passed directly to IO::Socket::INET)
User - username for SMTP AUTH
Password - password for SMTP AUTH

smtp2mix are two small mail proxies that relay incoming email to an anonymous remailer network.

The project allows the use of your preferred email client to send email anonymously via the mixmaster or mixminion network.

Poprox is a POP3 and SMTP transparent filtering proxy. The project does virus scanning using libclamav and is comparable to p3scan in philosophy.

Its design is based on a multi-process architecture which allows the detection of libclamav crashes. When this occurs, Poprox is able to delete the offending mail.

Debug mode can be toggled by sending a SIGUSR1 signal to the main process. Interactions with users can be translated in any language by using a simple template system.