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    Microsoft .NET components & libraries

    • EmailVerify.NET
      Email validation component, featuring full IETF-compliant syntax validation, DNS checking, mailbox existence test and tools for advanced batch processing.
    • ProxyClient.NET
      Powerful proxy client component with support for SOCKS 4, SOCKS 4a, SOCKS 5 and HTTP proxy servers, allowing to establish proxied connections from both new and existing sockets.
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    • Web-based, hosted email validation service
      Hosted email validation service that allows to validate lists of email addresses with ease, combining the power of our email validation technology with an array of fast, dedicated servers hosted at multiple worldwide locations and a super-cool web interface.

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    Email validation

    • Validate email addresses
      Free online demo of our email validation technologies, featuring full IETF-compliant syntax validation, DNS checking and mailbox existence test.

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    • EmailVerify.NET
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    • ProxyClient.NET
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  • Company blog

    Latest posts from our blog

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    • EmailVerify.NET is now part of the Cobisi family of products
      Published on Thursday, January 19, 2012

    • Just launched: hosted email validation service beta
      Published on Friday, August 05, 2011

    • New support for SMTP dialog extraction and analysis and advanced proxy binding
      Published on Tuesday, July 05, 2011

For developers For end-users

Email validation

- Syntax verification, according to IETF standards - DNS validations, including MX record(s) lookup - Disposable e-mail address (DEA) validation - SMTP connection and availability checking - Mailbox existence checking - Catch-all testing

For developers

EmailVerify.NET is the best choice for Microsoft .NET developers who need email address validation in their solutions. It features a very fast, multi-threaded verification library that can validate hundreds of email addresses per minute.

For end users

Our hosted email validation service allows to validate lists of email addresses with ease, combining the power of our email validation technologies with an array of dedicated servers and a modern web 2.0 interface.

Products showcase

EmailVerify.NET product box

EmailVerify.NET

EmailVerify.NET is a Microsoft .NET software component that validates email addresses with various tools, including:
  • Advanced syntax verification, according to IETF standards (RFC 1123, RFC 2821, RFC 2822, RFC 3696, RFC 4291, RFC 5321 and RFC 5322), with support for quoted words, domain literals, non-ASCII domain names (IDNA) and mailboxes, and comments
  • DNS validations, including MX record(s) lookup
  • Disposable and temporary email address detection
  • SMTP connection and availability checking
  • Mailbox existence checking, with greylisting and temporary unavailability support
  • Catch-all testing
Read more

ProxyClient.NET product box

ProxyClient.NET

ProxyClient.NET is a proxy client component targeted at the Microsoft .NET platform, that allows to easily establish proxied connections from both new and existing sockets. As of the current version, it can connect to proxy servers that use the following proxy protocols:

  • SOCKS v4
  • SOCKS v4a
  • SOCKS v5
  • HTTP-CONNECT proxy

Read more


Featured clients

Cobisi has risen to prominence as a leader provider in software development solutions, across a multitude of industries. Our product has shown proven success among dozens of Fortune 500 and industry-leading enterprise corporations.

About Cobisi

Cobisi is a leading provider of software development tools for the Microsoft .NET platform, catering to the increasing demand for advanced and innovative software solutions within today's enterprise markets.

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Cobisi - Via Caratti, 38 - 35132, Padova - Italy (European Union)
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