Gets the e-mail address of the sender of the mail message.
The pure e-mail address (user@domain.com, i.e. without display name or remarks) which was submitted to the SMTP server as the address of the message sender.
Since Send method can be used to send messages from an e-mail address different from the address specified by From property, the developer can use ActualSenderEmail property to obtain the actual address the message was sent from.
SmtpMessageNotSentEventArgs Class | MailBee.SmtpMail Namespace