How to programmatically set recipient of Elmah email

I've got this method here, I wanted to go e.Mail.To = MAC, but apparently it's a read only property, which leaves me completely stumped on how I can programmatically set the recipients. Basically I want to change the to address based on my deployment level (live/test/dev) I also want to dispose() (not send) the email for dev/test modes.

Is there another way round this?

public static void ErrorMail_Mailing(object sender, ErrorMailEventArgs e)
        {
            if (!GlobalHelper.IsLiveMode)
            {
                e.Mail.Dispose();
            }
            else
            {
                MailAddressCollection MAC = new MailAddressCollection();
                MAC.Add("A");

            }