RelayFax Server   
http://www.altn.com

RelayFax is a powerful email-to-fax and fax-to-email fax server. RelayFax Pro automates the process of sending, receiving and managing your network fax traffic. By integrating into existing email systems, RelayFax provides full faxing capabilities from your desktop. This fax software will prove cost effective and will increase productivity! RelayFax features include Caller ID Fax Routing - Using Inbound Fax Rules, RelayFax supports routing of faxes based upon Calling Number Display data (commonly called Caller ID); Outlook Address Book Integration - Client can use the shared contacts that are set up in your Outlook Address book so you don't have to maintain multiple address books; OCR Inbound Routing - Using Optical Character Recognition (OCR), RelayFax checks inbound faxes with your account database to utilize email forwarding and custom rules; SMTP Client - This application gives users a simple, yet complete, interface with which to send faxes; TWAIN Device Support - RelayFax is able to interface with TWAIN devices, such as scanners and digital cameras, quickly and easily; Fax Scheduling - Allows faxes to be assigned a specific date and time to be sent; Fax Broadcast Wizard - Allows easy setup and send the same fax to large numbers of recipients; Attachment Faxing - Allows RelayFax to extract and fax attachments as true documents; Custom Cover Sheets - Using a cover page editor, each individual user has the option of selecting the default cover page, as set by the Administrator, or using another; and Ring Count Delay - Sets the number of rings before a call is answered to facilitate receiving Caller ID information or using the line for voice calls; fax engine to support many more fax modems (Brooktrout, Gammalink, Bicom, Dialogic, and NMS boards), CAPI 2.0 support, DID routing support, OCR printer driver, Windows dialing rules support, PDF and PNG document support, and much more.

Bulk Mail Extreme   
http://leesoft.net

The software is a multi-thread program which means you can connect to different servers at the same time. And each server you can set a number of connections at the same time. For example, you have 2 SMTP servers, each you set 5 threads, and you use 3 DNS servers each with 2 threads, that means the program will launch 16 connections to send e-mails at the same time. It will speed up your sending process significantly. The program is able to send e-mails via SMTP servers. You can put many SMTP servers in the server list to carry out your e-mail campaigns. If the servers required authentication, when you put servers into the list, you could input the username and password. The program also support direct-sending e-mails to recipients. You have to put some DNS servers into the server list to help the program send e-mails. You can also launch the sending process with both kinds of servers. Some e-mails will be sent via SMTP servers, meanwhile others will be sent directly. When you do not have many SMTP servers to carry out your e-mail compaign, it could be very helpful. The e-mails could be customzied with recipients data. Using tags in e-mails, the program will replace them with recipients data. It helps you to make each e-mail is unique and achieve better results for your e-mail campaigns. You do not have to build recipients list manually. The program supports loading recipients data from text files, Access database files, Excel worksheets and other databases. It is very simple to load data. You even do not have to know how to operate database. On the other hand, if you are a database expert, you can write your own SQL command to load data as the way you want. It helps you to organize your recipients list easily. If you can not finished a e-mail campaign and want to resume it later, you can save the campaign as a project.The program can resume the campaign with log information to avoid sending repeated message to the same recipients.

RelayTest   
http://www.digiarch.org

Relay Test Pro is a tool for network administrators, that allows to test a specified mail server for open relays. It runs series of tests designed to detect open relays and create a detailed report of the findings. The test data can be automatically updated from the web to catch-up with the latest tricks used by spammers. Relay Test Pro is not designed to find vulnerable mail servers - it only scans one server at a time. Key features: Automatic web updates for the test data. Auto and manual test mode. Reference numbering for each test. Real time communication report. Result report with comments.

Enterprise Mail Server   
http://www.emailarms.com

Enterprise Mail Server is a high-performance SMTP POP3 server program designed for large enterprises and Internet Service Providers where having an ultra fast and reliable mail server is vital. It can be used along with virtually any mailer or email program; it is simple, light-weight, powerful and absolutely bullet-proof. It has a lot of security features and options that allow you to protect the server from DDoS attacks as well as safely block SPAM and spammers. Another great feature is that Enterprise Mail Server can be installed on several computers while the common message queue and user mailboxes can be kept on separate dedicated PCs. This will definitely facilitate email messaging in your organization. The user interface of the program is flexible and can be installed separately from the SMTP and POP3 services. This will give you an ability to manage all your servers from a single PC where only the user interface of Enterprise Mail Server is installed. The SMTP and POP3 services work as NT services therefore they will keep working in the logoff mode. For software debugging and testing purposes, the program has a testing mode you can use to check if your email clients work correctly. After you enable the testing mode, the server will accept your email messages, store them in the queue but will not deliver them to the actual recipients. As a personal solution, it is ideal for laptop PC users who travel a lot and have to use different Internet Service Providers (ISP) on the run. Using Enterprise Mail Server, you will never encounter a sending problem wherever you connect your PC to a network or phone socket. If the program can not deliver your email message directly, it will try to deliver it through SMTP gateway servers. You can maintain an unlimited number of SMTP gateway servers to achieve the best delivery rate. Just add all your SMTP servers you use in different places to the list of gateway servers and the program will always use a correct SMTP server.

1st SMTP Server   
http://www.emailarms.com

1st SMTP Server - a free SMTP relay server- is a simplest, easy to use SMTP mail relay server. It is used for relaying your email messages to its destinations quickly and easily. Whenever you need to send large amounts of email from a mass mailing program like Advanced Emailer You can install several servers like this one on different computers to minimize the load and to increase the speed of sending.