EWS Managed API: how to set From of email?

Question

I'm using EWS Managed API to sending email. Account "[e-mail]" have permissions "Send as" to use "[e-mail]" mailbox to send messages (from Outlook, it's work fine).

But I try from code - it's not work, in mail i'm read in the field "From" "[e-mail]".

....
EmailMessage message = new EmailMessage(service);
message.Body = txtMessage;
message.Subject = txtSubject;
message.From = txtFrom;
....
message.SendAndSaveCopy();

How to make sending mail on behalf of another user? :)

Tintinnabulum

Answer 1

It's been a while since I fiddled with the same thing, and I concluded that it isn't possible, in spite of having "Send as" rights.

Impersonation is the only way to go with EWS, see MSDN:

ExchangeService service = new ExchangeService();
service.UseDefaultCredentials = true;
service.AutodiscoverUrl("[email protected]");

// impersonate user e.g. by specifying an SMTP address:
service.ImpersonatedUserId = new ImpersonatedUserId(
    ConnectingIdType.SmtpAddress, "[email protected]");

If impersonation isn't enabled, you'll have to supply the credentials of the user on behalf of whom you want to act. See this MSDN article.

ExchangeService service = new ExchangeService();
service.Credentials = new NetworkCredential("user", "password", "domain");
service.AutodiscoverUrl("[email protected]");

Alternatively you can simply specify a reply-to address.

EmailMessage mail = new EmailMessage(service);
mail.ReplyTo.Add("[email protected]");

However, "Send as" rights do apply when sending mail using System.Net.Mail, which in many cases will do just fine when just sending e-mails. There are tons of examples illustrating how to do this.

// create new e-mail
MailMessage mail = new MailMessage();
mail.From = new MailAddress("[email protected]");
mail.To.Add(new MailAdress("[email protected]"));
message.Subject = "Subject of e-mail";
message.Body = "Content of e-mail";

// send through SMTP server as specified in the config file
SmtpClient client = new SmtpClient();
client.Send(mail);

Rivero

mail.ReplyTo will not work, there is no setter on this. public EmailAddressCollection ReplyTo { get; } – Latisha

Right, it's a collection. So you'll need to do mail.ReplyTo.Add("[email protected]") - I'll fix the example above. – Rivero

Using Impersonation I get an error on mail.send. - The primary SMTP address must be specified when referencing a mailbox – Heger

@Heger a quick search on Google, and I found this: social.msdn.microsoft.com/Forums/exchange/en-US/… - As the error indicates, you must use the primary SMTP address when specifying the mailbox you want to access, not a proxy/secondary address or alias. – Rivero

Answer 2

i think you should use the Sender property so the your code should look like:

EmailMessage message = new EmailMessage(service);
message.Body = txtMessage;
message.Subject = txtSubject;
message.Sender= txtFrom;
....
message.SendAndSaveCopy();

Mickens

No this doesn't appear to work. I've tried setting sender, sender.name and sender.Address and even though they get set, the email still comes from the account specified in your service setup. – Latisha