Outlook Add-in Property error

Question

I am trying to get the SMTP Address for an email and I have written a code to avoid getting the x.500 address. I get the SMTP address by accessing PropertyAccessor.GetProperty(PR_SMTP_ADDRESS) where PR_SMTP_ADDRESS = @"http://schemas.microsoft.com/mapi/proptag/0x39FE001E" ;

However, this works on some laptops while some give an error saying

"The property http://schemas.microsoft.com/mapi/proptag/0x39FE001E is unknown or cannot be found."

Any idea how to resolve this?

Answer 1

If you want the SMTP address , you can create an Outlook.Recipient from the X.500 and resolve the Recipient.AddressEntry to an Outlook.ExchangeUser .

string address = string.Empty;
Outlook.Recipient recipient = mailItem.Application.Session.CreateRecipient(mailItem.SenderEmailAddress);
if (recipient != null && recipient.Resolve() && recipient.AddressEntry != null) 
{
    Outlook.ExchangeUser exUser = recipient.AddressEntry.GetExchangeUser();
    if (exUser != null && !string.IsNullOrEmpty(exUser.PrimarySmtpAddress))
      address = exUser.PrimarySmtpAddress;
}

The error you are receiving with PR_SMTP_ADDRESS indicates that the MIME property isn't present in the mail message properties and you need an alternate means to determine the senders SMTP address. You cannot assume a MIME property will always be present.