Obtain SMTP Address using CDO in an un-managed environment

You can use the AddressEntry.Fields(PR_SMTP_ADDRESS) method where PR_SMTP_ADDRESS is 0x39FE001E.

Here are two examples of it:

' MAPI property tag for SMTP address

' Get first message from inbox

Set objFolder = objSession.Inbox

Set objMessages = objFolder.Messages

Set objMessage = objMessages.GetFirst()

' Get address

Set objAddressEntry = objMessage.Sender

strEMailAddress = objAddressEntry.Address

' Check if it is an Exchange object

If Left(strEMailAddress, 3) = "/o=" Then

' Get the SMTP address

strAddressEntryID = objAddressEntry.ID

'strEMailAddress = objSession.GetAddressEntry(strAddressEntryID).Fields(CdoPR_EMAIL).Value

strEMailAddress = objSession.GetAddressEntry(strAddressEntryID).Fields(g_PR_SMTP_ADDRESS_W).Value

End If

' Display the SMTP address of current user

MsgBox "SMTP address of current user: " & strEMailAddress

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In c# you can access it similarly like this:

MAPI.Session mysession = CreateObject("MAPI.Session") as MAPI.Session;

mysession.MAPIOBJECT = objNameSpace.Session.MAPIOBJECT;

MAPI.AddressEntry entries = mysession.CurrentUser as MAPI.AddressEntry;

string correo = entries.Address.ToString();

string entryID = string.Empty;

int id = int.Parse("39FE001F",System.Globalization.NumberStyles.HexNumber,null);

if (correo.Substring(0, 3) == "/o=")

{

entryID = entries.ID.ToString();

User = ((((mysession.GetAddressEntry(entryID) as MAPI.AddressEntry)).Fields as MAPI.Fields).get_Item(id, null) as MAPI.Field).Value.ToString();

}

else

User = correo;

MFCMapi - https://mfcmapi.codeplex.com/ is a great tool to use to understand the exchange store and message attributes.

Go ahead and have a play

Additional resources