.NET Email Validation Library is a .NET component you can integrate into your software applications if you want to check the integrity of email addresses. It's compatible with .NET Framework versions 2.0, 3.0, 3.5, 4.0, 4.5 and 4.5.1.

The downloaded package contains the source code compiled in C#, namely CS, RESX, CSPROJ, SLN and SETTINGS files. There's also a demo wrapped in a basic .NET Framework form, where you can enter any email address and click a button to validate it.

Log details can be examined in the bottom side of the window, where you can find out the program's start time and other information, such as if the mail server and public website exist, typo checkups, whether or not the email address is disposable and ends in a known domain, matches a fake email pattern, and so on.

.NET Email Validation Library supports RFC 821 for syntax checkups, MxRecord (Mail Exchange Record) for email address lookups, SMTP for mailbox verification, multiple threads, 4, 4a, 5 and HTTP proxies, and it can configure DNS server settings.

The tool is capable of identifying greylisting in order to check the email address later, and finding out when an anti-spam utility is blocking your mail server or IP address (e.g. spamhaus, spamblock.outblaze, SORBS). You can download both the installer and portable versions from this page.