Email.SetMaxAttempts(Attempts) example

this.EM = new Email();
var ErrVal = this.EM.Create(this);
if (ErrVal >= 0) {
  ....
  this.EM.SetMaxAttempts(10);
  this.EM.SendMessage();
  ...
}

To change the default value:

this.EM = new Email();
this.EM.MaxAttempts = 10;
var ErrVal = this.EM.Create(this);
...