Outlook SendUsingAccount is null when send drafted mail

Question

I'm using MailItem.SendUsingAccount to get address of sender. But when I try sending a draft mail, the SendUsingAccount become null, while SenderEmailAddress still has value (but not the email address, it's Exchange property).

So why SendUsingAccount is null? And is there any alternative way to get email address of sender?

Answer 1

SendUsingAccount can be null if the property was not explicitly set. In that case you can fall back to Application.Session.CurrentUser.