EmailValidator   
http://www.dimplesoftwares.com

ASP.Net Email Address Validator Control finds invalid email addresses without actually sending an email, in your mailing list or in your website form! ASP.Net Email Address Validator Control is highly scalable email validator solution. Capable of handling large volumes of addresses and it can be easily integrated into your website to check addresses on-the-fly ! Email Validator Control allows you to validate email addresses and MX Records, from any .NET application. Email Validator Control can be used from ASP.NET web pages, to windows forms, to web services. The only limitation to using Email Validator Control is your programming imagination. Email Validation Control first checks syntax of email address before actually checking with SMTP server and mailbox. By default ASP.Net Email Address Validator Control checks your system for your primary DNS server. As a benefit, you can specify specific DNS Servers in the form of a comma-delimited string. ASP.Net Email Address Validator Control will attempt to connect to each one, until a successful connection is made, and then use the first responsive DNS Server for the remainder of the ASP.Net Email Address Validator Control session. Email Validator Control has a built-in high performance internal cache that stores previously looked-up MX Records. For example, once the MX Records for hotmail.com have been determined, Email Validator Control no longer makes the expensive DNS Queries again, to determine those records. Instead, when the 2nd email address is encountered, that belongs to hotmail.com, Email Validator Control checks it's internal cache to see if the records are there, and then uses those records. By default the Email Validator Control cache is set to time out every 15minutes, however, this time can be set by the programmer, to be minutes, hours, or even days! Email Validator Control provides the capability to add addresses to a 'Bad Address' list !

Rock Solid Contact US System   
http://www.rebusnet.biz

A secure Contact US web form write in PHP, with optional visual confirmation, optional email confirmation, internationalization, easy to customize with template. Keep email private, eliminate 99.99% undesired spam. Prevent bot automation and invalid/spoof email. Double validations client/server keep resources used to minimum. Features: Template System. ( web page & email ) Optional Visual Confirmation. Optional Email Confirmation. English and French supported at this time. Basic support for Bi-Directional text. Time for email confirmation configurable. Private secret string used for request integrity. Page counter and advanced counter. Optional database auto prune. Time validity for visual confirmation configurable. Visual Confirmation (image) full configurable. background color, font color, font size, font rotation, number of digits, random mask , and more ...

Email Manager   
http://www.mailtools.biz

Do you have something to sell? Use this amazing software only in the free trial period, and you can start your business - it will find your clients in a few clicks. This is the new and revolutionary method to start or promote your affair. Email Manager is a high-speed newsletter mailing software meant for professionals who need to send information/notification to a large number of recipients very fast, combined with email address generation and validation process, and a simple to use but powerful WYSWYG editor for body email. Now with an intuitive interface-easy to use and full support to: Http://www.mailtools.biz. Other greatest features of this mass mailing Windows software utility is that you can showcase your message within an attractively designed template, you can integrate the name of your client into the subject email, you can set priority of email, ask for receipt confirmation, find the faster SMTP server of your provider, retrieve the list of commands accepted by your SMTP server, email address syntax verification, chameleon behavior with your SMTP server, timing options, completely customizable and more, it's yours to discover!

Email-Validation   
http://ezinedesigner.com

Example of how Javascrpt and PHP can work together to provide simple and extensible email form validation. Use this as a starting point for more complex server-side validation without screen refresh.