How To Send Mail to a Hidden Recipient Using MAPI (280377)

MORE INFORMATION

To cause Exchange to resolve the DN for a hidden mailbox, you must create an address entry (ADRENTRY) structure with PR_DISPLAY_NAME set to an one-off address. The format for this is

After you set up an address entry with the one-off address, you can make a call to the IAddrBook::ResolveName method to resolve the address entry. After this is done, you can send e-mail to the hidden mailbox.

The following code shows how to do this:

HRESULT AddressMessage(LPMAPISESSION lpSession, LPMESSAGE lpMessage, LPSTR pszRecip, long lRecipType)
{
	HRESULT hRes = S_OK;
	LPADRLIST lpAddrList = NULL;
	LPADRBOOK lpAddrBook = NULL;
	int cValues = 2;

	int cb = CbNewADRLIST(1);

	hRes = MAPIAllocateBuffer(cb, (LPVOID *)&lpAddrList);
	if (FAILED(hRes)) goto Cleanup;

	ZeroMemory(lpAddrList, cb);

	hRes = MAPIAllocateBuffer(
		cValues * sizeof(SPropValue), 
		(LPVOID FAR *)&lpAddrList->aEntries[0].rgPropVals);
	if (FAILED(hRes)) goto Cleanup;
	
	// pszRecip = "John Doe [EX:/O=EXCHANGE_ORG/OU=FIRST ADMINISTRATIVE GROUP/CN=RECIPIENTS/CN=USERNAME]"
	lpAddrList->aEntries[0].rgPropVals[0].ulPropTag = PR_DISPLAY_NAME;	 
	lpAddrList->aEntries[0].rgPropVals[0].Value.LPSZ = pszRecip;

	// lRecipType = MAPI_TO
	lpAddrList->aEntries[0].rgPropVals[1].ulPropTag = PR_RECIPIENT_TYPE;
	lpAddrList->aEntries[0].rgPropVals[1].Value.l = lRecipType;
	lpAddrList->aEntries[0].cValues = cValues;
	
	hRes = lpSession->OpenAddressBook(0, NULL, 0, &lpAddrBook);
	if (FAILED(hRes)) goto Cleanup;

	lpAddrList->cEntries = 1;

	hRes = lpAddrBook->ResolveName(0, 0, NULL, lpAddrList);
	if (FAILED(hRes)) goto Cleanup;

	hRes = lpMessage->ModifyRecipients(MODRECIP_ADD,lpAddrList);
	if (FAILED(hRes)) goto Cleanup;

Cleanup:
	FreePadrlist(lpAddrList);
	if (lpAddrBook) lpAddrBook->Release();
	return hRes;
}