This documentation is archived and is not being maintained.

Workbook.SendFaxOverInternet Method

Sends the active sheet in the workbook as a fax to the specified recipients.

Namespace: Microsoft.Office.Tools.Excel
Assembly: Microsoft.Office.Tools.Excel (in

public virtual void SendFaxOverInternet (
	[OptionalAttribute] Object Recipients,
	[OptionalAttribute] Object Subject,
	[OptionalAttribute] Object ShowMessage



The fax numbers and e-mail addresses of the people to whom the fax will be sent. Separate multiple recipients with a semicolon.


The subject line for the faxed document.


true displays the fax message before sending it; false sends the fax without displaying the fax message.

Using this method requires that the fax service is enabled on a user's computer.

The format used for specifying fax numbers in the Recipients parameter is either recipientsfaxnumber@usersfaxprovider or recipientsname@recipientsfaxnumber. You can access the user's fax provider information using the following registry path:


Use the value of the FaxAddress key at this registry path to determine the format to use for a recipient.

Optional Parameters

For information on optional parameters, see Understanding Optional Parameters in COM Interop.

The following code example uses the SendFaxOverInternet method to send the current workbook as a fax and display the fax message before sending it.

private void WorkbookSendFaxOverInternet()
    // First add a range value to make sure that the workbook
    // is faxed. An empty workbook will not be faxed.
    Globals.Sheet1.Range["A1", "A5"].Value2 = 55;
        "For your review.", true);