Microsoft Outlook DLL: adding the 'sender' field

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C#

ASP.NET

Outlook

Hi Guys,

Im trying to add the 'sender' field when sending an email using the Microsoft.Office.Interop.Outlook DLL, and having no luck.

I can create the message itself and add the recipient(s) easily with:

// create the message
    Outlook.MailItem oMsg = (Outlook.MailItem)oApp.CreateItem(Outlook.OlItemType.olMailItem);

// add the recipient
    Outlook.Recipient oRecip = (Outlook.Recipient)oMsg.Recipients.Add("myemail@address.com");

// resolve recipient
    oRecip.Resolve();

// add the sender...?
oMsg.SendUsingAccount = ????;

But all the examples I've seen adding the sender either do it by finding the Account in the Contacts folder, or by looping through the entire Global Address List. I can do neither of these as the address(es) I will be sending from do not exist in the Contacts folder, and the GAL contains 125,000 entries, taking forever to loop through.

I can get the actual email address of the person I would like to do the sending from, but how do I then get the Account for this address and add it as the sender?

Many thanks,

Nick