try something like below, I haven't tested bellow is working or not
Outlook.Application omApp = new Outlook.Application();
Outlook.NameSpace omNamespace = omApp.GetNamespace("MAPI");
Outlook.Recipient omUser = omNamespace.CreateRecipient("email1@abc.com");
omUser.Resolve();
if (!omUser.Resolved) return;
Outlook.MAPIFolder omDrafts = omNamespace.GetSharedDefaultFolder(omUser, Outlook.OlDefaultFolders.olFolderDrafts);
Outlook.MailItem omMailItem = (Outlook.MailItem)omDrafts.Items.Add();
omMailItem.To = "email2@abc.com";
omMailItem.Subject = "Test";
omMailItem.Body = "Test email";
omMailItem.Save();
omMailItem.Move(omDrafts);