Issues with Outlook dlls when sending emails

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Outlook

email

Microsoft

Hi,
I am using Microsoft.Office.Interop.Outlook to send emails from a C# application since SMTPClient is not allowed in my organization to send emails.When i run this in my local machine,it is working fine.But when i hosted the application in the server,it is giving error "Retrieving the COM class factory for component with CLSID {0006F03A-0000-0000-C000-000000000046} failed due to the following error: 80080005". please see the code snippet below which I have used.

         using Outlook = Microsoft.Office.Interop.Outlook;
                 .
                 .
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    string HTMLBody = "";
    Outlook.Application oApp = new Outlook.Application()
      // Get the NameSpace and Logon information.
     Outlook.NameSpace oNS = oApp.GetNamespace("mapi");
      // Log on by using a dialog box to choose the profile.
      oNS.Logon(Missing.Value, Missing.Value, true, true);
      // Create a new mail item.
      Outlook.MailItem mail = (Outlook.MailItem)oApp.CreateItem(Outlook.OlItemType.olMailItem);
 HTMLBody = File.ReadAllText("D:\\TLDR_VacationPlanner\\Email emplates\\VacationTemplate.html");
             mail.To = strEmail;
mail.HTMLBody = HTMLBody;
 mail.Send();

oNS.Logoff();
           //oRecip = null;
           mail = null;
           oNS = null;
           oApp = null;

I have copied and registered the dlls in the server using Regasm.Please advise.

Thanks.