MailKit 发送邮件的学习记录

前提：

开通smtp服务，如果是126或163邮件步骤如下:

1、打开 “POP3/SMTP/IMAP” 菜单，如下图：

 2、点击开启,如下图：

 3、点继续开启，如下图：

 4、通过手机发送短信

 5、点击下图中的“我已发送”

 6、开通成功，得到设备码（备注：此设备码就做为MailKit里的密码）。

代码：

首先使用nuget引用MailKit，然后测试代码如下：

string mailAccount = "abc@126.com";
            string mainPassword = "ABVCDEFGDSDF";
            var client = new MailKit.Net.Smtp.SmtpClient();
            client.Connect("smtp.126.com", 25, SecureSocketOptions.None);
            client.AuthenticationMechanisms.Remove("XOAUTH2");
            client.Authenticate(mailAccount, mainPassword);

            var message = new MimeMessage();
            message.From.Add(new MailboxAddress("testNameFrom", "abc@126.com"));
            message.To.Add(new MailboxAddress("testNameTo", "abcd@163.com"));
            message.Subject = "测试发送邮件的标题";

            var html = new TextPart("html")
            {
                Text = @"<p>您好，张三：<br>
                        <p>附件里是详细内容，请查收！<br>
                        <p>-- 管家王小明<br>"
            };

            var alternative = new Multipart("alternative");
            alternative.Add(html);

            string pngPath = @"C:UserswjxDesktoplogo.png";
            var attachmentPng = new MimePart("image", "png")
            {
                Content = new MimeContent(File.OpenRead(pngPath), ContentEncoding.Default),
                ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
                ContentTransferEncoding = ContentEncoding.Base64,
                FileName = Path.GetFileName(pngPath)
            };

            string zipPath = @"C:UserswjxDesktop中国百度的logo.zip";
            var attachmentZip = new MimePart("application", "zip")
            {
                Content = new MimeContent(File.OpenRead(zipPath), ContentEncoding.Default),
                ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
                ContentTransferEncoding = ContentEncoding.Base64,
                FileName = Path.GetFileName(zipPath)
            };

            var multipart = new Multipart("mixed");
            multipart.Add(alternative);

            multipart.Add(attachmentPng);
            multipart.Add(attachmentZip);

            message.Body = multipart;

            client.Send(message);
            client.Disconnect(true);