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SmtpClient.SendMailAsync Method (String, String, String, String)

.NET Framework 4.6 and 4.5

Sends the specified message to an SMTP server for delivery as an asynchronous operation. . The message sender, recipients, subject, and message body are specified using String objects.

Namespace:  System.Net.Mail
Assembly:  System (in System.dll)

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public Task SendMailAsync(
	string from,
	string recipients,
	string subject,
	string body


Type: System.String

A String that contains the address information of the message sender.

Type: System.String

A String that contains the addresses that the message is sent to.

Type: System.String

A String that contains the subject line for the message.

Type: System.String

A String that contains the message body.

Return Value

Type: System.Threading.Tasks.Task
Returns Task.
The task object representing the asynchronous operation.


from is null.


recipients is null.


from is Empty.


recipients is Empty.

This operation will not block. The returned Task> object will complete once the message has been sent.


The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

.NET Framework

Supported in: 4.6, 4.5
© 2015 Microsoft