property Address: string;

Address is a String property that represents an Email address in RFC 2822-compliant form. 

Updating the Name or Address portions of the email address causes the Text property to be updated to reflect the new email address. 

For example: 

   // var AEmail: TIdEmailAddressItem;

   AEmail.Text := '"John Doe" <jdoe@some.net>';
   // AEmail.Name contains 'John Doe'
   // AEmail.Address contains 'jdoe@some.net'
   // AEmail.User contains 'jdoe'
   // AEmail.Domain contains 'some.net'

   AEmail.Name := 'Jane Doe';
   AEmail.Address := 'janed@another.net';
   // AEmail.Text contains '"Jane Doe" <janed@another.net>'

Use Text to access the concatenated Name and Address for the email address. 

Use User and Domain to access the mailbox and registered organization for the email address.