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(Mono C#) Verify DKIM-Signature Headers in Downloaded EmailDownloads email from an IMAP server and verifies the DKIM-Signature header(s) in each email, if present.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Imap imap = new Chilkat.Imap(); // Connect to an IMAP server, login, select mailbox.. // Use TLS imap.Ssl = true; imap.Port = 993; bool success = imap.Connect("imap.someMailServer.com"); if (success == true) { success = imap.Login("myLogin","myPassword"); if (success == true) { success = imap.SelectMailbox("Inbox"); } } if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } Chilkat.Dkim dkim = new Chilkat.Dkim(); // Download a max of 10 emails and verify any DKIM-Signature headers // that are present. // Download emails by sequence numbers (not UIDs). bool bUid = false; int seqNum; int j; int n = imap.NumMessages; if (n > 10) { n = 10; } Chilkat.JsonObject json = new Chilkat.JsonObject(); json.EmitCompact = false; // To verify DKIM-Signature headers, we need the exact unmodified MIME bytes of each email. Chilkat.BinData mimeData = new Chilkat.BinData(); seqNum = 1; while (seqNum <= n) { // The FetchSingleBd method was introduced in v9.5.0.76 success = imap.FetchSingleBd(seqNum,bUid,mimeData); if (success != true) { Debug.WriteLine(imap.LastErrorText); return; } // Get the number of DKIM-Signature headers. int numDkim = dkim.NumDkimSigs(mimeData); // Verify each.. j = 0; while (j < numDkim) { Debug.WriteLine("------ DKIM Signature " + Convert.ToString(j)); success = dkim.DkimVerify(j,mimeData); if (success != true) { Debug.WriteLine("Not valid."); } else { Debug.WriteLine("valid."); } // Show the additional information about the signature verification json.Load(dkim.VerifyInfo); Debug.WriteLine(json.Emit()); // The JSON contains information such as this: // { // "domain": "amazonses.com", // "selector": "7v7vs6w47njt4pimodk5mmttbegzsi6n", // "publicKey": "MIGfMA0GCSqG...v2GvWPqGHz6uqeQIDAQAB", // "canonicalization": "relaxed/simple", // "algorithm": "rsa-sha256", // "signedHeaders": "Subject:From:To:Date:Mime-Version:Content-Type:References:Message-Id:Feedback-ID", // "verified": "yes" // } j = j + 1; } seqNum = seqNum + 1; } success = imap.Disconnect(); |
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