A string that contains the contents of this System.Net.Mail.MailAddress.
The string returned by this method is not necessarily identical to the string specified when the instance was created. If the MailAddress.DisplayName property is not null and not equal to string.Empty (""), MailAddress.ToString returns a string composed using the following syntax:
MailAddress.DisplayName <MailAddress.User@MailAddress.Host>
If MailAddress.DisplayName is null or is equal to string.Empty, MailAddress.ToString returns the value of the MailAddress.Address property.