1st SMTP Server
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...
http://www.emailarms.com/downloads/zip/fstsmtp.zip - 1Mb - Download - Screenshot

Local SMTP Relay Server
Local SMTP Relay Server is a SMTP server program for Windows that lets you send email messages directly from your computer. Along with a mass mailer the program can be used as a relay server for sending newsletters, distributing messages to different mailing lists, sending notifications to your... Local SMTP Relay Server supports all email programs including Outlook Express and Eudora, but best optimized to work with Outlook Express. ... Local SMTP Relay Server is able to send thousands of emails per minute with a regular DSL Internet connection.
http://www.getfreefile.com/download/localsrv.zip - 1Mb - Download - Screenshot

Super Webscan
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.
http://www.npust.com/dwn/setup.exe - 381Kb - Download - Screenshot

Protoport Sendmail Server
Powerful direct remailer software actr as SMTP relay. It puts email messages directly to mailbox of recipient. ISP's SMTP server is not involved. The program will query DNS for MX records, and deliver emails to so-called mail exhange servers. This is much more faster and more reliable. ... You can even use HTTP proxy server for sending emails. ... This is useful if you are behind corporate firewall, for example.
http://www.protoport.com/ftp/mailserv.exe - 80Kb - Download - Screenshot

SoftCab Sendmail Server
Powerful direct remailer software actr as SMTP relay. It puts email messages directly to mailbox of recipient. ISP's SMTP server is not involved. The program will query DNS for MX records, and deliver emails to so-called mail exhange servers. This is much more faster and more reliable. ... You can even use HTTP proxy server for sending emails. ... This is useful if you are behind corporate firewall, for example.
http://www.softcab.com/ftp/mailserv.exe - 80Kb - Download - Screenshot

1st Mail Server
1st Mail Server is a fast and secure Professional SMTP/POP3 server program. You can use this program in many environments ranging from a corporate mail server to a standalone SMTP relay for your laptop. Any standard mail client can be used to send email using this server. ... This way, even if you cannot deliver your email directly to the destination, you will be able to still send it using one of the gateways. ... You can have multiple SMTP gateways in your server if you travel a lot with your laptop.
http://www.softstack.com/download/firstmailsrv.zip - 3Mb - Download - Screenshot

Email caster
Email caster is a marketing tool software that can validate emails list and send customized message  directly to recipients and get instant feedback. It has embeded in SMTP relay ,so you do not need using the SMTP relay server of your ISP. In addition,Email caster can give you instant feedback...
http://www.worldminer.com/emailcaster.exe - 699Kb - Download - Screenshot

Advanced SMTP Server
Advanced SMTP Server is a system-tray local SMTP server program for Windows that lets you send email messages directly from your computer to recipient mailboxes. Along with a mass mailer the program can be used as a relay server for sending newsletters, distributing messages to different mailing... Advanced SMTP Server is very fast, while sending, it establishes dozens of SMTP connections, and gets the most out of your Internet connection. ... Advanced SMTP Server is able to send thousands of emails per minute with a regular DSL Internet connection.
http://www.softstack.com/download/advsmtp.zip - 1Mb - Download - Screenshot

X-Ray Mail Assistant Beta
X-Ray is an email header filter and POP/SMTP server switching tool. It runs as a local POP/SMTP relay server and scans your incoming and/or outgoing mail for user specified mail headers. Once it finds a match it can change the header, remove it, replace it or perform some other special... In addition, the program allows you to set up multiple profiles for POP and SMTP servers and switch between them from the system tray. ... X-Ray can also run as an NT service.
http://www.xrayapp.com/install/xraybeta.zip - 297Kb - Download - Screenshot

SMTP Preprocessor
SMTP Preprocessor is advanced tool for mail administrators. It enhances functionality of corporate mail server. The program receives SMTP messages before corporate SMTP server, on-the-fly changes or rejects them, and retransmits result to the server. ... SMTP Preprocessor can reject connection based on remote host IP address (Black List), presence of reverse DNS PTR record, validity of HELO or EHLO command and connections limit; reject MAIL command based on sender address (Black List) and transactions limit; reject RCPT command based on recipient address (Private Recipients List),...
http://www.smsoft.ru/presmtp/psmtp101.exe - 130Kb - Download - Screenshot