Check checks the syntax and if valid, it checks the mailbox by connecting to the target mailserver The fromEmail is used as from address in the communication to the foreign mailserver.

CheckDisposable returns true if the mail is a disposal mail, false otherwise.

CheckMailbox checks the checkEmail by connecting to the target mailbox and returns the result.

CheckSyntax returns true for a valid email, false otherwise.

Check checks the syntax and if valid and checks the bad domain list does not do mailbox checking - an RP tweak.

Result contains the information about an email check.