Top 20 NuGet spam Packages

A set of e-mail components which implement IMAP, SMTP, POP3, Exchange Web Services, SSL/TLS support, parsing and building MIME and S/MIME messages, Outlook .MSG and .PST conversions, mail merge over database, OAuth 2.0, DNS MX lookup, e-mail address validation, parsing winmail.dat, bounced messages ...
Machine Learning Library that builds Spam/Ham model to be used within AspNetCore Web Api project.
.NET Library for Akismet integration. Akismet filters out your comment and track-back spam for you, so you can focus on more important things. A full tutorial on how you can use the library you can find here: http://blog.cretze.ro/?p=78.
HTTP request gatekeeper that uses LINQ validation rules on custom rule sets to keep your site safe
.NET portable async library for verifying comments with Akismet.
CleanTalk service API for C#. It is invisible protection from spam, no captchas, no puzzles, no animals and no math.
Block Spammer IPs on your website using honey pot project api. See https://github.com/rohitlodha/SpamBlock.Net for details.
C# API Library
Bad Behavior .NET is a .NET port of the original Bad Behavior WordPress plugin. It is built as an HTTP module, so you can just drop it into any existing website and enable it with a simple change to your web.config file.