Mailkit SMTP error语言 - BareLinefeedsAreIllegal

Question

远程服务器返回'550 5.6.2 smtpsend.barelinefeedsareillegal;消息包含裸线馈示，无法通过数据发送'

            var message = new MimeMessage();
            message.From.Add(new MailboxAddress(nameFrom, mailboxFrom));
            message.Subject = Subject;
            message.To.Add(new MailboxAddress(mailboxTo));
            var bodyBuilder = new BodyBuilder();
            var multipart = new Multipart("mixed");
            bodyBuilder.HtmlBody = "Test Body";
            multipart.Add(bodyBuilder.ToMessageBody());

            byte[] bytes = System.IO.File.ReadAllBytes("Test.gif");

            var attachment = new MimePart("binary", "bin")
            {
                ContentObject = new ContentObject(new MemoryStream(bytes), ContentEncoding.Base64),
                ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
                ContentTransferEncoding = ContentEncoding.Binary,
                FileName = "F2.pdf"
            };
            multipart.Add(attachment);
            message.Body = multipart;

            using (var client = new SmtpClient())
            {
                // For demo-purposes, accept all SSL certificates (in case the server supports STARTTLS)
                client.ServerCertificateValidationCallback = (s, c, h, e) => true;
                client.Connect(ssServer, ssPort, MailKit.Security.SecureSocketOptions.Auto);
                // Note: since we don't have an OAuth2 token, disable
                // the XOAUTH2 authentication mechanism.
                client.AuthenticationMechanisms.Remove("XOAUTH2");
                // Note: only needed if the SMTP server requires authentication
                client.Authenticate(ssMailBox, ssMailBoxPassword);
                client.Send(message);
            }

我已经尝试编码contentEncoding.base64和contentencoding.binary。当我跳过附件部分时，邮件的发送正确。" test.gif"只是我上传的随机gif。

我已经阅读了有关块或bdat命令的信息，但对此不确定，或者如何将其与MailKit一起使用...有什么建议吗？我只是想发送带有附件的普通SMTP邮件，这并不难：|

Answer 1

解决方案是，@jstedfast建议更改：

ContentTransferEncoding = ContentEncoding.Base64

我误解了，尝试更改contentObject。

谢谢@jstedfast