如何用C#来发送公司内部邮件

public bool Send()
{
SmtpClient client = new SmtpClient();
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.EnableSsl = false;
client.Port= 25;
client.Timeout = 10000;
client.DeliveryMethod = SmtpDeliveryMethod.Network;//这句的意思是要用外网发送邮件？？

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