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Instead of using BCC, you should send a separate copy of your message to each recipient that you want to receive a blind copy. The problem with BCC is that spam filters frequently block messages that do not have the recipient s e-mail address in the From header. Therefore, if you use BCC, the message will very likely be filtered.
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MailMessage has the following less frequently used properties:
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DeliveryNotificationOptions Instructs the SMTP server to send a message to the
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address specified in MailMessage.From if a message is delayed, fails, or is successfully delivered or relayed to another server. The enumeration is of type DeliveryNotificationOptions, and the values are OnSuccess, OnFailure, Delay, None, and Never.
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ReplyTo The e-mail address that replies will be sent to. Because the .NET Frame-
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work does not act as an e-mail client, and therefore your application will not
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typically be receiving e-mail, in most cases you should simply set MailMessage .From to the address that should receive replies instead of using ReplyTo.
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Priority
The priority of the message. This does not in any way affect how the .NET Framework or the mail server handles the message. However, the priority might be visible in the recipient s e-mail client. The priority is also useful for filtering automatically generated e-mail based on the priority of the event that initiated the e-mail. This enumeration is of type MailPriority and can have values of Normal, High, and Low.
How to Attach Files
To attach a file, add it to the MailMessage.Attachments AttachmentCollection by calling the MailMessage.Attachments.Add method. The simplest way to add a file is to specify the file name:
' VB Dim m As MailMessage = New MailMessage() m.Attachments.Add(New Attachment("C:\boot.ini")) // C# MailMessage m = new MailMessage(); m.Attachments.Add(new Attachment(@"C:\boot.ini"));
You can also specify a MIME (Multipurpose Internet Mail Extensions) content type using the System.Net.Mime.MediaTypeNames enumeration. There are special MIME types for text and images, but you will typically specify MediaTypeNames.Application.Octet. The following code sample (which requires System.IO and System.Net.Mime in addition to System.Net.Mail) demonstrates how to use a Stream as a file attachment and how to specify the MIME type:
' VB Dim m As MailMessage = New MailMessage() Dim sr As Stream = New FileStream("C:\Boot.ini", FileMode.Open, FileAccess.Read) m.Attachments.Add(New Attachment(sr, "myfile.txt", MediaTypeNames.Application.Octet)) // C# MailMessage m = new MailMessage(); Stream sr = new FileStream(@"C:\Boot.ini", FileMode.Open, FileAccess.Read); m.Attachments.Add(new Attachment(sr, "myfile.txt", MediaTypeNames.Application.Octet));
As the previous example demonstrates, you should specify a filename when creating an attachment from a Stream object. Otherwise, the attachment will be labeled with a generic name such as application_octect-stream.dat . Because the file extension would be incorrect, users would not be able to easily open the attachment in the correct application.
Lesson 1: Creating a Mail Message
How to Create HTML E-mails
To create an HTML e-mail message, supply HTML-tagged content for MailMessage .Body and set the MailMessage.IsBodyHtml attribute to True, as the following code sample demonstrates:
' VB Dim m As MailMessage = New MailMessage m.From = New MailAddress("lance@contoso.com", "Lance Tucker") m.To.Add(New MailAddress("burke@contoso.com", "Burke Fewel")) m.Subject = "Testing HTML" ' Specify an HTML message body m.Body = "<html><body><h1>My Message</h1><br>This is an HTML message.</body></html>" m.IsBodyHtml = True ' Send the message Dim client As SmtpClient = New SmtpClient("smtp.contoso.com") client.Send(m) // C# MailMessage m = new MailMessage(); m.From = new MailAddress("lance@contoso.com", "Lance Tucker"); m.To.Add(new MailAddress("burke@contoso.com", "Burke Fewel")); m.Subject = "Testing HTML"; // Specify an HTML message body m.Body = "<html><body><h1>My Message</h1><br>This is an HTML message.</body></html>"; m.IsBodyHtml = true; // Send the message SmtpClient client = new SmtpClient("smtp.contoso.com"); client.Send(m);
MailMessage.Subject is always plain text. You can define MailMessage.Body just like any HTML Web page. However, most e-mail clients will ignore the <head> section, will ignore any client-side scripts, and will not automatically download images from Web sites. To embed images into an HTML message so that they appear when the user clicks the message (without requiring the user to explicitly choose to download images), use the AlternateView and LinkedResource classes. First, create an HTML message using AlternateView, and then add images using LinkedResource, as the following sample code demonstrates:
' VB ' Create the HTML message body ' Reference embedded images using the content ID Dim htmlBody As String = "<html><body><h1>Picture</h1><br>" + _ "<img src=""cid:Pic1""></body></html>"
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