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Jericho / StrongGrid

Strongly typed library for the entire SendGrid v3 API, including webhooks
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An invalid character was found in the mail header: ';' #332

Closed yrki closed 3 years ago

yrki commented 4 years ago

I received an e-mail with the following item in the header:

To: Undisclosed recipients:;

It fails with the error message: An invalid character was found in the mail header: ';'

It looks like the e-mail is sent through Outlook / Exchange

Jericho commented 4 years ago

Do you have the stack trace of this exception and/or small code sample to reproduce?

Jericho commented 4 years ago

You said that you "received an e-mail". Does this mean you are using the ParseInboundEmailWebhookAsync method of the WebhookParser class?

Jericho commented 4 years ago

If that's the case and you are indeed parsing an inbound email, can you share the JSON payload sent to you by SendGrid to help me reproduce the problem?

Jericho commented 4 years ago

Out of curiosity, I ran a quick little test to see if Microsoft's own email address parsing will accept such an email address:

var rawEmailAddress = "Undisclosed recipients:;";
var parsedAddress = new System.Net.Mail.MailAddress(rawEmailAddress);

When I run this test, I get An invalid character was found in the mail header: ';' exception you mentioned.

If I remove the semi-colon, I get An invalid character was found in the mail header: ':'. 

var rawEmailAddress = "Undisclosed recipients:";
var parsedAddress = new System.Net.Mail.MailAddress(rawEmailAddress);

If I remove both the semi-colon and the colon I get The specified string is not in the form required for an e-mail address.

var rawEmailAddress = "Undisclosed recipients";
var parsedAddress = new System.Net.Mail.MailAddress(rawEmailAddress);

So it seems to me that the address in your scenario is hopelessly malformed and it's not clear to me at this point what StrongGrid could do to resolve this issue.

yrki commented 4 years ago

I'll send you the total payload tomorrow morning. And I agree, the format in this field is not valid. But if it comes from exchange and an outlook client, it should maybe be fixed.

man. 29. jun. 2020, 16:09 skrev Jericho notifications@github.com:

Out of curiosity, I ran a quick little test to see if Microsoft's own email address parsing will accept such an email address:

var rawEmailAddress = "Undisclosed recipients:;";var parsedAddress = new System.Net.Mail.MailAddress(rawEmailAddress);

When I run this test, I get An invalid character was found in the mail header: ';' exception you mentioned.

If I remove the semi-colon, I get An invalid character was found in the mail header: ':'.

var rawEmailAddress = "Undisclosed recipients:";var parsedAddress = new System.Net.Mail.MailAddress(rawEmailAddress);

If I remove both the semi-colon and the colon I get The specified string is not in the form required for an e-mail address.

var rawEmailAddress = "Undisclosed recipients";var parsedAddress = new System.Net.Mail.MailAddress(rawEmailAddress);

So it seems to me that the address in your scenario is hopelessly malformed and it's not clear to me at this point what StrongGrid could do to resolve this issue.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/Jericho/StrongGrid/issues/332#issuecomment-651147078, or unsubscribe https://github.com/notifications/unsubscribe-auth/ACYJSYPED4QBDKNS2DYTROTRZCOCJANCNFSM4OLAKVGA .

Jericho commented 4 years ago

When you say it should be fixed, what's your expectation? How do you propose StrongGrid should handle this scenario?

yrki commented 4 years ago

The whole header is:

--xYzZY
Content-Disposition: form-data; name="headers"

Received: by mx0043p1las1.sendgrid.net with SMTP id mrCC8DhRJZ Mon, 29 Jun 2020 06:32:20 +0000 (UTC)
Received: from NOR01-OL1-obe.outbound.protection.outlook.com (mail-ol1nor01on2133.outbound.protection.outlook.com [40.107.224.133]) by mx0043p1las1.sendgrid.net (Postfix) with ESMTPS id 959C3502055 for <979923953@invoice.yrki.no>; Mon, 29 Jun 2020 06:32:18 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yrki.no; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=flhXmZSCbwkmBPW/gjZe8pEXw0lkybROQJReraU+A5U=; b=NHdWbOY0kb6i8RxcaFtjORV4Sigj0Vd56MZi8cNuRrYAP+m6CSUcbFlnUBmK32c8FCLVBKLGg+J6DqTiKHzV65F1Dz1njQxzxvbzldRd5mdniIoxtWduIo5QGcz78xKws6HTxAaRfNcpzctwFXU+6/fnkJ4yv9ifeUo7nVZkVlw=
Resent-From: <979923953@yrki.no>
Received: from AM6P191CA0061.EURP191.PROD.OUTLOOK.COM (2603:10a6:209:7f::38) by SVAP279MB0061.NORP279.PROD.OUTLOOK.COM (2603:10a6:f10:7::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3131.21; Mon, 29 Jun 2020 06:32:14 +0000
Received: from VE1EUR01FT005.eop-EUR01.prod.protection.outlook.com (2603:10a6:209:7f:cafe::13) by AM6P191CA0061.outlook.office365.com (2603:10a6:209:7f::38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3131.20 via Frontend Transport; Mon, 29 Jun 2020 06:32:14 +0000
X-MS-Exchange-Authentication-Results: spf=fail (sender IP is 137.221.30.6) smtp.mailfrom=staples-solutions.com; yrki.no; dkim=pass (signature was verified) header.d=corpstaplessolutions.onmicrosoft.com;yrki.no; dmarc=fail action=none header.from=staples-solutions.com;
Received-SPF: Fail (protection.outlook.com: domain of staples-solutions.com does not designate 137.221.30.6 as permitted sender) receiver=protection.outlook.com; client-ip=137.221.30.6; helo=mail2.intility.com;
Received: from mail2.intility.com (137.221.30.6) by VE1EUR01FT005.mail.protection.outlook.com (10.152.2.142) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3131.20 via Frontend Transport; Mon, 29 Jun 2020 06:32:13 +0000
Received-SPF: None (mail2.intility.com: no sender authenticity information available from domain of Butikk.Alnabru@staples-solutions.com) identity=pra; client-ip=40.107.3.113; receiver=mail2.intility.com; envelope-from="Butikk.Alnabru@staples-solutions.com"; x-sender="Butikk.Alnabru@staples-solutions.com"; x-conformance=sidf_compatible
Received-SPF: Pass (mail2.intility.com: domain of Butikk.Alnabru@staples-solutions.com designates 40.107.3.113 as permitted sender) identity=mailfrom; client-ip=40.107.3.113; receiver=mail2.intility.com; envelope-from="Butikk.Alnabru@staples-solutions.com"; x-sender="Butikk.Alnabru@staples-solutions.com"; x-conformance=sidf_compatible; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:40.92.0.0/15 ip4:40.107.0.0/16 ip4:52.100.0.0/14 ip4:104.47.0.0/17 ip6:2a01:111:f400::/48 ip6:2a01:111:f403::/48 include:spfd.protection.outlook.com -all"
Received-SPF: Pass (mail2.intility.com: domain of postmaster@EUR03-AM5-obe.outbound.protection.outlook.com designates 40.107.3.113 as permitted sender) identity=helo; client-ip=40.107.3.113; receiver=mail2.intility.com; envelope-from="Butikk.Alnabru@staples-solutions.com"; x-sender="postmaster@EUR03-AM5-obe.outbound.protection.outlook.com"; x-conformance=sidf_compatible; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:40.92.0.0/15 ip4:40.107.0.0/16 ip4:52.100.0.0/14 ip4:104.47.0.0/17 ip6:2a01:111:f400::/48 ip6:2a01:111:f403::/48 include:spfd.protection.outlook.com -all"
Authentication-Results-Original: mail2.intility.com; spf=None smtp.pra=Butikk.Alnabru@staples-solutions.com; spf=Pass smtp.mailfrom=Butikk.Alnabru@staples-solutions.com; spf=Pass smtp.helo=postmaster@EUR03-AM5-obe.outbound.protection.outlook.com; dkim=pass (signature verified) header.i=@corpstaplessolutions.onmicrosoft.com; dmarc=pass (p=none dis=none) d=staples-solutions.com
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And I agree I'm not sure if StrongGrid should handle this. The only solution to handle this is just to swallow the exception and ignore errors from the System.Net.Mail.MailAddress-method, which may not be good.

It seems that the mail that is originally is a newsletter with all the recipients in the BCC-field. I'm not sure if they have sent it through a newsletter-program or via outlook.

Anyhow the mails received in this format does not have any value for us, so if the parsing fails due to this, it will just generate a parse error.

Thanks for your time! :)

Jericho commented 4 years ago

Here is the current StrongGrid logic: 

var parsedAddress = new System.Net.Mail.MailAddress(rawEmailAddress);
return new MailAddress(parsedAddress.Address, parsedAddress.DisplayName);

As you can see, we delegate the parsing of email addresses to System.Net.Mail.MailAddress to figure out the Address and DisplayName properties which is the source of the problem you are experiencing.

Thinking out loud: maybe we could ignore parsing exceptions and use a null value in lieu of Address and the whole rawEmailAddress in lieu of DisplayName. Something along these line:

try
{
  var parsedAddress = new System.Net.Mail.MailAddress(rawEmailAddress);
  return new MailAddress(parsedAddress.Address, parsedAddress.DisplayName);
}
catch
{
  return new MailAddress(null, rawEmailAddress);
}

I'm not totally sold on this idea though. We need to think further on the possible ramifications (if any) of the MailAddress with a null Email property.

Jericho commented 3 years ago

I will ad this logic to the upcoming release.

Jericho commented 3 years ago

:tada: This issue has been resolved in version 0.73.0 :tada:

The release is available on:

Your GitReleaseManager bot :package::rocket: