MailboxValidator.SingleValidation (nuget): This .NET library provides an easy way to call the MailboxValidator API which validates if an email address is a valid one.  This module can be used in many types of projects such as:  * validating a user's email during sign up * cleaning your mailing list prior to an email marketing campaign * a form of fraud check  An API key is required for this library to function.  Go to https://www.mailboxvalidator.com/plans#api to sign up for FREE API plan and you'll be given an API key.
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