Send Email from a shared email address without SMTP server

Question

I want to send an email using a given shared mailbox name programmatically. I don't have access to a smtp server so I can't used System.Net.Mail.

I am using Outlook = Microsoft.Office.Interop.Outlook;

How can I send from a shared mailbox email rather than the default email address?

outlook.MailItem mail application.CreateItem(outlook.OlItemType.olMailItem) as outlook.MailItem;
try
   {          

    if (mail.Subject.Contains("Highway Alert")
    {

        mail.SendUsingAccount = "sharedmailboxemail@email.com"
        mail.Send();
        System.Diagnostics.Debug.WriteLine("Email Sent ");
    }
    else

How does Outlook send emails? Does it connect to an SMTP server or Exchange? — gunr2171, Nov 05 '19 at 18:12
Have you tried any of these? https://www.google.com/search?q=site%3Astackoverflow.com+C%23+send+email+exchange Also, IIRC, Exchange _IS_ an SMTP server. Try https://stackoverflow.com/questions/5173530/send-an-email-using-exchange-server-only — gunr2171, Nov 05 '19 at 18:17
@gunr2171 Yeah, I tried those but I dont have access to the SMPTP server address. I can send programmatically using my default address but not from another email address. — John Marshall, Nov 05 '19 at 18:27
The Exchange server most likely won't allow you to send emails as a user other than what you login with. You need to work with your IT department on this one. — gunr2171, Nov 05 '19 at 18:28
@gunr2171 you are probably right, I know in Visual Basic using Access Database it worked. I was trying to see if it is possible in C#. — John Marshall, Nov 05 '19 at 18:58
@DmitryStreblechenko SendUsingAccount looks for account in the Account.Sesssions.Accounts but I wanted to input an email address. — John Marshall, Nov 05 '19 at 18:59
If you want to send on behalf of another Exchange user, set the MailItem.SentOnBehalfOfName property before sending. — Dmitry Streblechenko, Nov 05 '19 at 20:49

Eugene Astafiev · Answer 1 · 2019-11-05T20:35:53.470

The MailItem.SendUsingAccount property returns or sets an Account object that represents the account under which the MailItem is to be sent. For example:

private void SendUsingAccountExample()
{
    Outlook.MailItem mail = Application.CreateItem(Outlook.OlItemType.olMailItem) as Outlook.MailItem;
    mail.Subject = "Our itinerary";
    mail.Attachments.Add(@"c:\travel\itinerary.doc", Outlook.OlAttachmentType.olByValue,
        Type.Missing, Type.Missing);
    Outlook.Account account = Application.Session.Accounts["Hotmail"];
    mail.SendUsingAccount = account;
    mail.Send();
}

See Send a mail item by using a Hotmail account for more information.

Please remember that another account should be configured in Outlook in that case.

The SentOnBehalfOfName property makes sense only in case of Exchange profiles/accounts. Moreover, you need to have the required permissions to send on behalf of another person. See Issue with SentOnBehalfOfName for a similar discussion.

In case if you have multiple accounts configured in the profile you can use the SendUsingAccount property which allows to an Account object that represents the account under which the MailItem is to be sent.

 Sub SendUsingAccount() 
  Dim oAccount As Outlook.account 
  For Each oAccount In Application.Session.Accounts 
   If oAccount.AccountType = olPop3 Then 
    Dim oMail As Outlook.MailItem 
    Set oMail = Application.CreateItem(olMailItem) 
    oMail.Subject = "Sent using POP3 Account" 
    oMail.Recipients.Add ("someone@example.com") 
    oMail.Recipients.ResolveAll 
    oMail.SendUsingAccount = oAccount 
    oMail.Send 
   End If 
  Next 
 End Sub

Send Email from a shared email address without SMTP server

1 Answers1