The MailMessage class represents the content of a mail message. The SmtpClient class transmits email to the SMTP host that you designate for mail delivery. You can create mail attachments using the Attachment class.

 Classes

	Class	Description
	AlternateView	Represents the format to view an email message.
	AlternateViewCollection	Represents a collection of AlternateView objects.
	Attachment	Represents an attachment to an e-mail.
	AttachmentBase	Base class that represents an email attachment. Classes Attachment, AlternateView, and LinkedResource derive from this class.
	AttachmentCollection	Stores attachments to be sent as part of an e-mail message.
	LinkedResource	Represents an embedded external resource in an email attachment, such as an image in an HTML attachment.
	LinkedResourceCollection	Stores linked resources to be sent as part of an e-mail message.
	MailAddress	Represents the address of an electronic mail sender or recipient.
	MailAddressCollection	Store e-mail addresses that are associated with an e-mail message.
	MailMessage	Represents an e-mail message that can be sent using the SmtpClient class.
	SmtpClient	Allows applications to send e-mail by using the Simple Mail Transfer Protocol (SMTP).
	SmtpException	Represents the exception that is thrown when the SmtpClient is not able to complete a Send or SendAsync operation.
	SmtpFailedRecipientException	Represents the exception that is thrown when the SmtpClient is not able to complete a Send or SendAsync operation to a particular recipient.
	SmtpFailedRecipientsException	Infrastructure. The exception that is thrown when e-mail is sent using an SmtpClient and cannot be delivered to all recipients.
	SmtpPermission	Controls access to Simple Mail Transport Protocol (SMTP) servers.
	SmtpPermissionAttribute	Controls access to Simple Mail Transport Protocol (SMTP) servers.

 Delegates

	Delegate	Description
	SendCompletedEventHandler	Represents the method that will handle the SendCompleted event.

 Enumerations

	Enumeration	Description
	DeliveryNotificationOptions	Describes the delivery notification options for e-mail.
	MailPriority	Specifies the priority of a MailMessage.
	SmtpAccess	Specifies the level of access allowed to a Simple Mail Transport Protocol (SMTP) server.
	SmtpDeliveryMethod	Specifies how email messages are delivered.
	SmtpStatusCode	Specifies the outcome of sending e-mail by using the SmtpClient class.

 See Also

Reference

System.Net

System.Net.Mime

Other Resources

Network Programming

Best Practices for System.Net Classes

Configuring Internet Applications

Introducing Pluggable Protocols

Internet Protocol Version 6

Network Tracing

Programming Pluggable Protocols

Security in Network Programming