Validating email addresses in vb net

After trying a few different ones, I came across Kellerman .NET Email Validation Library and I knew I had found exactly what I was looking for.For this we use this regular expression: /[a-z A-Z0-9_-. NET component that would save me the time and trouble of reading RFC 821 and writing a bunch of complex regexes. NET Email Validation Library which goes far beyond simple validation and detects so many things that I didn’t even think about: fake emails, disposable addresses, grey listing and much more. It recognizes thousands of disposable email domains such as,, and Plus, like the other Kellerman libraries, it is very easy to use with just a line or two of code. NET Email Validation Library by Kellerman Software is the cutting edge of email validation. The fake email pattern checker eliminates numerous bad emails that actually return as valid email addresses with our competitors. One way to prevent fraud is to disallow free email addresses when customers order products on your e Commerce site. NET Email Validation Library recognizes thousands of free email domains such as,, and It detects mail servers that implement grey listing so the email addresses can be verified later. Detect when your mail server or IP Address is being blocked by anti-spam software.

I needed a solution that was both fast and reliable.

It detects servers that are blocking your mail server. This happens in shared hosting environments when a spammer uses the same mail server as your business.

NET Email Validation library doesn't have levels; it has options. Yes it performs industry standard syntax checking, mx Record (Mail Exchange Record) lookups, and mailbox verification using multiple threads asynchronously. Prevent bots from posting messages on your message board by preventing them from using disposable email addresses.

In the following example user enters a email address.

When the user presses Enter, than Java Script checks that email address is valid or not.

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