Free autoresponder software for linux

Mail::Toaster is an installer for a collection of software which provides a full-featured mail server. The system is built around the qmail mail transport agent, with many additions and modifications
Main features:
- SMTP Mail Server (SMTP-AUTH, chk-user, SPF, TLS, tarpitting, RBL)
- Virtual Domain Hosting w/delegated administration
- Virtual Domain Users
- Mailing List (Ezmlm)
- AutoResponder
- Web Based E-Mail (Sqwebmail, Squirrelmail, V-Webmail)
- Web Based Domain Administration
- Mail Filtering (rbls, SpamAssassin, simscan, Qmail-Scanner)
- Virus Scanning (ClamAV, F-Prot, Uvscan)
- SMTP roaming via SMTP-AUTH, POP-AUTH, & IMAP-AUTH
- SMTP roaming via SMTP-submission (port 587)
- POP3, POP3-SSL
- IMAP, IMAP-SSL (Courier IMAP)
- CGI frontend to mail features
- Log processing and pretty graphs (via RRDutil)
- Auto-Installs of MySQL, Apache, phpMyAdmin, and more
- Centralized configuration files
- Support for clusters of qmail servers
- Builds SSL certs for Apache, Qmail, & Courier
Security - Mail::Toaster supports secure connections from the email client (via POP3, IMAP, SMTP, and webmail) to the server. If the remote (destination) email server supports it, we also encrypt the email as it travels across the public Intenet from server to server. Thus, if you happen to be using two Mail::Toasters and your email clients are configured to use SSL, you have a fully encrypted path from the email sender to the final recipient.
State of the Art Filtering - Mail::Toaster has sophisticated filtering capabilities built right in. A default installation blocks all viruses and will detect 85% of the spam. With a little bit of training, its reasonable to expect and achieve 99% spam filtering accuracy.
Flexibility - Mail::Toaster provides an extremely flexible framework to allow you to build your email system your way. This flexibility makes it easy to migrate existing systems to Mail::Toaster and also allows Mail::Toaster to work in diverse environments and OS platforms.
Support - There is a thriving and active support community available on the mailing list. The web forums are also frequented by quite a few helpful folks. If you need more support than folks are willing to provide, commercial support is available.
Enhancements:
- Primarily code quality improvements.
- Rewrites of major portions of the code using techniques described in Perl Best Practices.
- Many more tests, much better tests, and more error testing within the functions.
- A new Webmail interface.
- Its not terribly "pretty" yet, but is much more user friendly and functional.

ISPConfig is an open source hosting controlpanel for Linux. ISPConfig is licensed under BSD license.
Main features:
Interface Languages
- English
- German
- Spanish
- Dutch
- Italian
- Polish
- If you are interested in translating the interface, please contact us at dev [at] ispconfig [dot] org.
Daemons and Software
- Apache 1.3.x/2.0.x
- Proftpd & vsftpd
- Supports The Following Mail Servers: Sendmail & Postfix
- All POP3 & POP3s Servers
- All IMAP & IMAPs Servers
- BIND 8/9
- Firewall Configuration
- Monitoring Of Services And Automatic Restart
- Web FTP
- Web Mail Interface
- phpMyAdmin Integration
Domain options and services
- PHP incl. Safemode
- SSI
- CGI-Directories
- SSL Sites and Certificates
- Frontpage 2002 extensions (if installed on the server)
- MySQL Databases
- Disk Quota
- Webalizer statisics
- Traffic statistics
- Disk usage statistics and overquota warnings
- Individual standard index and error pages per domain
- Individual records for inclusion in apache vhost (admin only)
- Domain redirects
- Backup
- Log-Quota and Logrotation
- Standard CGI
- WAP pages
- Hosting templates
Email and user accounts
- System, FTP and Mail users
- Autoresponder
- Mailquota
- Mailscanner
- Mailfilter
- CatchAll Emal addresses
- Shell-User
- Automatic User prefix
- ClamAV antivirus filter
- SpamAssassin Spamfilter Settings
General
- Creation of folders / categories where resellers / clients / sites can be stored in.
- 4 different logins (Administrator, Resellers, Clients, Email-Users)
- Update manager
- Recycle bin to restore deleted clients / users / domains
- Language settings per user
- Secondary DNS
- Automatic network configuration for new IP Addresses (optional)
- Welcome mails for resellers / clients
- Several reseller limits
- Reseller Quota

VHCS is a Professional Control Panel Software for shared, reseller, virtual and dedicated server management.
VHCS delivers a complete hosting automation appliance by offering significant security, total-cost-of-ownership, and performance advantages over competing commercial solutions.
With VHCS Pro you can configure your server and applications, create user with domains with a few point-and-click operations that take less than a minute. There is no limit to the number of resellers, users and domains that can be created.
At the core of VHCS Pro are 3 easy-to-use, Web-based control panels. VHCS provides graphic user interfaces for the administrators, resellers and users.
Main features:
Free
- VHCS is Free Software and dedicated to giving users, administrators and developers the ultimate level of control over their linux web servers, and their data.
Usable
- VHCS understands that usability is about creating software that is easy for everyone to use, not about piling on features.
Supported
- Beyond the worldwide VHCS Community, VHCS is supported by the leading companies in Linux and Unix.
Accessible
- Free Software is about enabling software freedom for everyone, including users, administrators and developers with disabilities. VHCS Accessibility framework is the result of several years of effort, and makes VHCS the most accessible control panel for any Linux platform.
International
- VHCS is used, developed and supported in dozens of languages, and we strive to ensure that every piece of VHCS software can be translated into all languages.
Enhancements:
- Some bugs were fixed.
- The autoresponder was fixed.
- SQL users can be added again without a prefix.
- Some GUI fixes were done.