当 DKIM 使用 Mailkit 和 Mimekit 对标头进行签名时，我看到一个奇怪的问题，Gmail 报告错误“dkim=neutral（正文哈希未验证）”。
我在这里做错了吗？请在下面找到我的代码以及附加的实际收到的邮件的屏幕截图。
string ReturnName = "DMC12";
string FromDomain = "backtothefuture.net";
string FromEmail = "marty@" + FromDomain;
string FromName = "Marty McFly";
string SenderName = "Marty McFly";
string ToEmail = "George.mcfly.1960@gmail.com";
string MailServer = "DMC12.large.timemachine.com";
string TextBody = @"If you put your mind to it, you can accomplish anything. One other thing. If you guys ever have kids, and one of them, when he's eight years old, accidentally sets fire to the living room rug... go easy on him!";
string HtmlBody = string.Format(@"<b>如果你把你的头脑，它可以完成任何事情。 另一件事。 如果你们有孩子，其中一个，当他八岁时，不小心把火烧在客厅地毯上...去容易对他！</b>");
string Subject = "Message from Marty (1960)!";
string ToName = "George McFly";
string DKIMdomain = FromDomain;
string DKIMSigner = "btfreturns.com";
string ReturnEmail = "DocBrown@" + MailServer;
string SenderEmail = "marty@" + MailServer;
string privatekey = System.IO.File.ReadAllText("dkim.private.key");
var client = new SmtpClient(new ProtocolLogger("smtp.txt")); // logging SMTP connections
try
{
client.Connect(MailServer, 25);
}
catch (SmtpCommandException ex)
{
Console.WriteLine("Error trying to connect: {0}", ex.Message);
Console.WriteLine("\tStatusCode: {0}", ex.StatusCode);
return;
}
catch (SmtpProtocolException ex)
{
Console.WriteLine("Protocol error while trying to connect: {0}", ex.Message);
return;
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return;
}
client.LocalDomain = MailServer;
var message = new MimeMessage();
MailboxAddress RecepientAddress = new MailboxAddress(ToName, ToEmail);
message.From.Add(new MailboxAddress(FromName, FromEmail)); // From Address
var builder = new BodyBuilder();
builder.TextBody = TextBody;
builder.HtmlBody = HtmlBody;
List<MailboxAddress> To = new List<MailboxAddress>();
To.Add(RecepientAddress);
message.Subject = Subject;
message.Body = builder.ToMessageBody();
message.Sender = new MailboxAddress(SenderName, SenderEmail); // Sender Address
message.To.Add(RecepientAddress);
message.MessageId = Guid.NewGuid().ToString("N") + "@" + new System.Net.Mail.MailAddress(message.Sender.Address).Host;
using (Stream s = (new MemoryStream(Encoding.UTF8.GetBytes(privatekey ?? ""))))
{
var headersToSign = new[] { HeaderId.From, HeaderId.To, HeaderId.Subject, HeaderId.Date, HeaderId.MessageId };
var signer = new DkimSigner(s, DKIMdomain, DKIMSigner);
signer.SignatureAlgorithm = DkimSignatureAlgorithm.RsaSha1;
message.Sign(signer, headersToSign, DkimCanonicalizationAlgorithm.Relaxed, DkimCanonicalizationAlgorithm.Relaxed);
}
client.Send(message, new MailboxAddress(ReturnName, ReturnEmail), To);
client.Disconnect(true);
client.Connect(MailServer, 25);
client.Dispose();