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Hi Everybody,

I have a problem with sending email from my MVC application. Here is the code

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
              service.UseDefaultCredentials = false;
              service.Credentials = new WebCredentials("EmailSender", "Password");
              string serviceUrl = "";
              service.Url = new Uri(serviceUrl);
              EmailMessage emailMsg = new EmailMessage(service);
              emailMsg.From = currentUser.Email; //This email is different from Credential email
              emailMsg.Subject = mailSubject;
              emailMsg.Body = mailBody;


The thing is that the Credential account is different from current user email. The users don't login in the domain so I have no access to their credential. So I want to use an account to send email instead of the users.It was possible to send email even without credential when we were using Exchange server but in office 365 I get this error:

The user account which was used to submit this request does not have the right to send mail on behalf of the specified sending account., Cannot submit message.

What I have tried:

The Credential user has 'Send As' access. maybe need on behalf access or something like that!?
Any idea?
Updated 21-Oct-16 1:59am

1 solution

Configure Exchange so that "EmailSender" has the rights to send messages on behalf of other people. You'll need to google how you do that, Exchange config is outside the scope of this site.

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