How to Open outlook at client end in asp.net mvc

Question

How to Open outlook at client end in asp.net mvc

My code is below but its not working after publishing

        try
        {
            List<string> lstAllRecipients = new List<string>();
            //Admin email id

            lstAllRecipients.Add(ConfigurationManager.AppSettings["SenderEmail"].ToString());


            Outlook.Application outlookApp = new Outlook.Application();
            Outlook._MailItem oMailItem = (Outlook._MailItem)outlookApp.CreateItem(Outlook.OlItemType.olMailItem);
            Outlook.Inspector oInspector = oMailItem.GetInspector;


            // Recipient
            Outlook.Recipients oRecips = (Outlook.Recipients)oMailItem.Recipients;
            foreach (String recipient in lstAllRecipients)
            {
                Outlook.Recipient oRecip = (Outlook.Recipient)oRecips.Add(recipient);
                oRecip.Resolve();
            }

            //Add CC
            string pcoEmail = objregister.getPCOEmail(Id);
            Outlook.Recipient oCCRecip = oRecips.Add(pcoEmail);
            oCCRecip.Type = (int)Outlook.OlMailRecipientType.olCC;
            oCCRecip.Resolve();

            //Add Subject
            oMailItem.Subject = "Mail from PCO Regarding - " + Id;

            // body, bcc etc...

            //Display the mailbox
            oMailItem.Display(true);
        }
        catch (Exception objEx)
        {
            Response.Write(objEx.ToString());
        }

Answer 1

In ASP.Net MVC, your code will be executing in the server side, it will never be executed in the client machine. If you are using Exchange online / Microsoft 365, you may use graph API to send email.

https://learn.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=http