How to open the new Outlook to send en email with attachments?

Question

Hello,

I would like to know how to open the new Outlook mail to send an email with attachments in c#.

I tried generating an .eml file and open it in the new outlook but the new Outlook does not support the X-Unsent: 1 flag. So the email does open, but you cannot send it.

Thanks

Answer 1

Hi @Wambo ,

You can use Microsoft.Office.Interop.Outlook Namespace.

Check the following code.

using Outlook = Microsoft.Office.Interop.Outlook;

            Outlook.Application outlookApp = new Outlook.Application();

            Outlook.MailItem mailItem = (Outlook.MailItem)outlookApp.CreateItem(Outlook.OlItemType.olMailItem);

            mailItem.To = "recipient@example.com";

            mailItem.Subject = "Test Email";

            mailItem.Body = "This is a test email.";

            mailItem.Attachments.Add(@"C:\Path\To\File1.txt");

            mailItem.Send();

Best Regards.

Jiachen Li

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Answer 2

the new outlook (Monarch), does not support automation and only has limited support of .msg and .eml files. you should use the graph api to access the email system. you can use the mailto cmd to create an email, but it does not support attachments:

var proc = new System.Diagnostics.Process();
proc.StartInfo.FileName = "mailto:******@somewhere.com?subject=hello&body=some text";
proc.Start();