Getting the sender from Outlook.MailItem returns null-CodePudding

I am trying to get the sender (From) of an Outlook.MailItem without success. It returns null.

I have tried below.

Attempt 1:

string from = omi.SenderEmailAddress;

Attempt 2:

var exch = omi.Sender.GetExchangeUser(); // it returns null
if (exch != null)
{
    string from = exch.PrimarySmtpAddress;
}

Also I have checked omi.SenderEmailType to see what type is, and it returns null.

Note: omi is an Outlook.MailItem object.

CodePudding user response：

Keep in mind that the sender related properties are only populated on the received or already sent messages. If you are accessing these properties on a message being submitted, they won't be present until the message is sent and moved to the Sent Items folder.

CodePudding user response：

You can check out the SendUsingAccount property. If it is not set then you can use the Namespace.CurrentUser property which returns the display name of the currently logged-on user as a Recipient object.

CodePudding user response：

Assuming you have an Outlook.MailItem that is not null, you should be able to follow this process to retrieve the sender's email address, adapted from the Microsoft Documentation.

string PR_SMTP_ADDRESS = @"http://schemas.microsoft.com/mapi/proptag/0x39FE001E";

if (omi == null)
{
    throw new ArgumentNullException();
}
if (omi.SenderEmailType == "EX")
{
    Outlook.AddressEntry sender = omi.Sender;
    
    if (sender != null)
    {
        // Now we have an AddressEntry representing the Sender
        if (sender.AddressEntryUserType == Outlook.OlAddressEntryUserType.olExchangeUserAddressEntry ||
            sender.AddressEntryUserType == Outlook.OlAddressEntryUserType.olExchangeRemoteUserAddressEntry)
        {
            // Use the ExchangeUser object PrimarySMTPAddress
            Outlook.ExchangeUser exchUser = sender.GetExchangeUser();
            
            if (exchUser != null)
            {
                return exchUser.PrimarySmtpAddress;
            }
            else
            {
                return null;
            }
        }
        else
        {
            return sender.PropertyAccessor.GetProperty(PR_SMTP_ADDRESS) as string;
        }
    }
    else
    {
        return null;
    }
}
else
{
    return omi.SenderEmailAddress;
}