Autoroute SMTP   
http://www.mailutilities.com

Autoroute SMTP (ARS) is designed for automatic switching between SMTP servers depending on what network you are currently working in. E.g. you have two Internet service providers - FIRST and SECOND. Normally, IP address authorisation is used for SMTP servers, therefore when you are connected to the FIRST ISP you can send mail to any e-mail address from any e-mail address through his mail server (e.g., SMTP.FIRST.COM). In the same way, having established connection with the SECOND ISP you can freely use its server SMTP.SECOND.COM. But not vice versa. Normally, in that situation user has to get a e-mail address from a free mail server and use its SMTP server to deliver mail, though server of ones ISP ensures much faster and more convenient delivery. The problem is that one has two ISP's. Autoroute SMTP offers solution for that problem. The only thing you have to do is to enter one mail server with address localhost (or 127.0.0.1) in your mail client settings. Then, the mail client will establish connection with Autoroute SMTP, and Autoroute SMTP will automatically switch it to the right server. To choose the right server, Autoroute SMTP compares your IP address to IP addresses of SMTP servers you have entered and chooses one that is located in your sub-net. If no server was found, Autoroute SMTP can use server your specified in the settings. You can also disable automatic server detection, or even choose a mail server in automatic mode yourself from the list you have created by clicking the "Next > > " button. With Autoroute SMTP you always can easily show the way to your letters.

Super Webscan   
http://www.npust.com

It can search for smtp server also locates and identifies open relay SMTP servers. It is an all in one program, you tell it how to scan and it does ALL of the work for you. No more using 3 or 4 programs and wasting hours of your time doing Whois lookups, etc., we do everything.

QK SMTP Server   
http://www.qksoft.com

QK SMTP Server is a powerful but easy-to-use smtp server software, which can send mails from localhost to the recipients' mailboxes directly at an amazingly high speed. Arrived or not, you will get a feedback instantly. QK SMTP Server can work with most mail client software, such as Outlook Express, Eudora, IncrediMail, the Bat!, Mutt, KMail, Pegasus, DevMail, Mail Bomber, Delta Mail, Foxmail; It can send mails at an amazing high spead with multithreads technology, even large amount of mails or newsletters. QK SMTP Server has three modes to send emails:Send directly to recipients' mail boxes;Send via a transit SMTP Server;Send directly first; if it failed, relay to transit SMTP Server. you can select one according your personal condition. Qk SMTP Server boasts a very easy-to-use interface,You don't need to bother with advanced techincal settings. The concise interface and on-hand HELP even can make a new hand to use it freely. While advanced users can control the process as they like in the configuration panel. QK SMTP Server supports SMTP Authentication before sending emails. Therefore you can kick off those anonymous users who are going to abuse your computer. http://www.qksoft.com/qk-smtp-server/

SMTP Wizard ActiveX   
http://www.seekfordsolutions.com

SMTP Wizard +SSL v3 allows you to be able to send E-mail by accessing an SMTP server with minimal knowledge of how SMTP works and very little code. There are many features for simplifying tasks of accessing and utilizing an SMTP server and sending e- mail. The control talks directly with the SMTP servers and completely bypasses MAPI and any of the problems that MAPI has.(i.e. Security dialogs and other nuisances) SMTP Wizard +SSL v3 allows you to: Be used in a scriptable language such as VBScript Use Secure Password Authentication for logins Utilize the features of ESMTP Get the server abilities Send very large messages Verify that each recipient is valid, otherwise choose whether to proceed Use every command that SMTP protocol supports. Comes with SMTPMessage object which makes creating an RFC 822 compliant message incredibly easy Custom headers and values Multiple TO , CC and BCC recipients Add file attachments Communicate over secure channels when talking to a SSL enabled server Send HTML and regular plain-text messages Send the messages Asynchronously freeing your application to do other work No User Interaction Required NEW - Now supports SOCKSv4 and SOCKSv5 Plus more Simple Mail Transport Protocol Wizard lets you send mail with ease. The SMTPMessage object gives you quick access to building a message, adding files to it, and sending it through a mail server. Your project can easily send out email notifications, error reports, customer responses, and a whole lot more. This control works with any ActiveX container and even works in ActiveX scriptable languages such as VBScript.

Complete Mail Server   
http://www.softfolder.com

Complete Mail Server is high-performance professional SMTP/POP3 server software engineered for corporations and ISPs to satisfy business needs in ultra fast, flexible and reliable mail server. It works along with any email program or mailer and offers a lot of security features and options to allow you to protect the server from the outside and restrict the SPAM activity. In case of parallel mail processing, Complete Mail Server can be installed on several computers while the common message queue and user mailboxes can be kept on separate dedicated computers. You can assign specific configuration for each installation to facilitate email messaging in your organization. Friendly user interface of the program can be installed separately from the SMTP and POP3 services to give you ability to manage each of the server installations from a single PC. The SMTP and POP3 services can work as NT services and will keep working in the logoff mode. The special test mode is provided for software debugging and testing purposes that you can use to check if your email clients work properly. While test mode is activated, the server accepts your email messages, stores them in the queue but nothing delivers to the actual recipients. For example, this feature can be useful for developers to debug the scripts written with PHP, Perl, Java or other software. The SMTP Gateway Servers is another significant feature that makes Complete Mail Server just perfect for personal usage especially for the laptop PC users who have to change Internet Service Providers (ISP) while traveling around the world. Simply add all your SMTP servers that you use in different places to the unlimited list of gateway servers and the program will always find a correct SMTP server wherever you connect your PC to the Internet with any type of connection; so you do not have to modify SMTP settings of your email program each time you change ISPs.