Email Validation in client/server side JavaScript
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How to validate an email address in JavaScript
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Creating an email that can trigger a script
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How do I receive email and process it in a web application
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Validating email addresses using jQuery and regex
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JavaScript validation for empty input field
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How to create custom email alert template in SharePoint 2010
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Custom validation for a form?
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What is the best Java email address validation method?
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Prevent Multiple Form Submissions (Server side)
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Allow User to input HTML in ASP.NET MVC - ValidateInput or AllowHtml
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Validate that string contains only allowed characters in Ruby
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How to use [submission:values] in Email template in Webforms
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How to implement control validation in a Windows Forms application?
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How to validate an email address using a regular expression?
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Rails' client-side-validation form_for error
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To what extend should I rely on client-side validation?
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How do you make sure email you send programmatically is not automatically marked as spam?