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BounceDetectorTests.cs
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// developed by Rui Lopes (ruilopes.com). licensed under MIT.
using MimeKit;
using System.IO;
using Xunit;
namespace MailBounceDetector.Tests
{
public class BounceDetectorTests
{
[Fact]
public void NonBouncePostfix()
{
var message = MimeMessage.Load(OpenFixture("non_bounce_postfix_hello_world.eml"));
var result = BounceDetector.Detect(message);
Assert.False(result.IsBounce);
Assert.False(result.IsHard);
Assert.False(result.IsSoft);
}
[Fact]
public void ExchangeNonExistingMailbox()
{
var message = MimeMessage.Load(OpenFixture("bounce_exchange_non_existing_mailbox.eml"));
var result = BounceDetector.Detect(message);
Assert.True(result.IsBounce);
Assert.True(result.IsHard);
Assert.False(result.IsSoft);
Assert.Equal("5 Permanent Failure", result.PrimaryStatus.ToString());
Assert.Equal("1 Addressing Status", result.SecundaryStatus.ToString());
Assert.Equal("11 Bad destination mailbox address", result.CombinedStatus.ToString());
Assert.Equal("mx.google.com", result.RemoteMta);
Assert.Equal("test.local", result.ReportingMta);
Assert.Equal("[email protected]", result.FinalRecipient);
Assert.Equal("[email protected]", result.UndeliveredMessageId);
Assert.IsType<TextPart>(result.DeliveryNotificationPart);
Assert.NotNull(result.DeliveryStatus);
Assert.IsType<MessagePart>(result.UndeliveredMessagePart);
Assert.Null(result.DiagnosticCodes);
Assert.Equal("failed", result.Action);
}
[Fact]
public void PostfixNonExistingMailbox()
{
var message = MimeMessage.Load(OpenFixture("bounce_postfix_non_existing_mailbox.eml"));
var result = BounceDetector.Detect(message);
Assert.True(result.IsBounce);
Assert.True(result.IsHard);
Assert.False(result.IsSoft);
Assert.Equal("5 Permanent Failure", result.PrimaryStatus.ToString());
Assert.Equal("1 Addressing Status", result.SecundaryStatus.ToString());
Assert.Equal("11 Bad destination mailbox address", result.CombinedStatus.ToString());
Assert.Null(result.RemoteMta);
Assert.Equal("test.local", result.ReportingMta);
Assert.Equal("[email protected]", result.FinalRecipient);
Assert.Equal("[email protected]", result.UndeliveredMessageId);
Assert.IsType<TextPart>(result.DeliveryNotificationPart);
Assert.NotNull(result.DeliveryStatus);
Assert.IsType<MessagePart>(result.UndeliveredMessagePart);
Assert.NotNull(result.DiagnosticCodes);
Assert.Equal(2, result.DiagnosticCodes.Length);
Assert.Equal("", result.DiagnosticCodes[0]);
Assert.Equal("unknown user: \"[email protected]\"", result.DiagnosticCodes[1]);
Assert.Equal("failed", result.Action);
}
[Fact]
public void QmailNoHostFound()
{
var message = MimeMessage.Load(OpenFixture("bounce_qmail_no_host_found.eml"));
var result = BounceDetector.Detect(message);
Assert.True(result.IsBounce);
Assert.True(result.IsHard);
Assert.False(result.IsSoft);
Assert.Equal("5 Permanent Failure", result.PrimaryStatus.ToString());
Assert.Equal("3 Mail System Status", result.SecundaryStatus.ToString());
Assert.Equal("30 Other or undefined mail system status", result.CombinedStatus.ToString());
Assert.Null(result.RemoteMta);
Assert.Equal("silverton.berkeley.edu", result.ReportingMta);
Assert.Equal("[email protected]", result.FinalRecipient);
Assert.Equal("[email protected]", result.UndeliveredMessageId);
Assert.IsType<TextPart>(result.DeliveryNotificationPart);
Assert.NotNull(result.DeliveryStatus);
Assert.IsType<MessagePart>(result.UndeliveredMessagePart);
Assert.NotNull(result.DiagnosticCodes);
Assert.Equal(2, result.DiagnosticCodes.Length);
Assert.Equal("", result.DiagnosticCodes[0]);
Assert.Equal("Sorry, I couldn't find any host by that name.", result.DiagnosticCodes[1]);
Assert.Equal("failed", result.Action);
}
[Fact]
public void QmailExtraLinesBetweenRecipientParagraphs()
{
var message = MimeMessage.Load(OpenFixture("bounce_qmail_extra_lines_between_recipient_paragraphs.eml"));
var result = BounceDetector.Detect(message);
Assert.True(result.IsBounce);
Assert.True(result.IsHard);
Assert.False(result.IsSoft);
Assert.Equal("5 Permanent Failure", result.PrimaryStatus.ToString());
Assert.Equal("3 Mail System Status", result.SecundaryStatus.ToString());
Assert.Equal("30 Other or undefined mail system status", result.CombinedStatus.ToString());
Assert.Null(result.RemoteMta);
Assert.Equal("example.com", result.ReportingMta);
// NB even though there are multiple failure paragraphs, only the last one is returned here.
Assert.Equal("[email protected]", result.FinalRecipient);
Assert.Equal("[email protected]", result.UndeliveredMessageId);
Assert.IsType<TextPart>(result.DeliveryNotificationPart);
Assert.NotNull(result.DeliveryStatus);
Assert.Equal(3, result.DeliveryStatus.StatusGroups.Count);
Assert.Equal("dns;example.com", result.DeliveryStatus.StatusGroups[0]["Reporting-MTA"]);
Assert.Equal("rfc822;[email protected]", result.DeliveryStatus.StatusGroups[1]["Final-Recipient"]);
Assert.Equal("rfc822;[email protected]", result.DeliveryStatus.StatusGroups[2]["Final-Recipient"]);
Assert.IsType<MessagePart>(result.UndeliveredMessagePart);
var undeliveredMessage = ((MessagePart)result.UndeliveredMessagePart).Message;
Assert.Equal("are you there?", undeliveredMessage.Subject);
Assert.Equal("Just checking.", undeliveredMessage.TextBody);
Assert.Equal(2, undeliveredMessage.To.Count);
Assert.Equal("[email protected]", undeliveredMessage.To[0].ToString());
Assert.Equal("[email protected]", undeliveredMessage.To[1].ToString());
Assert.NotNull(result.DiagnosticCodes);
Assert.Equal(2, result.DiagnosticCodes.Length);
Assert.Equal("", result.DiagnosticCodes[0]);
Assert.Equal("Sorry, I couldn't find any host by that name.", result.DiagnosticCodes[1]);
Assert.Equal("failed", result.Action);
}
[Fact]
public void QmailWrappedInMultipartAlternateNonExistingMailbox()
{
var message = MimeMessage.Load(OpenFixture("bounce_qmail_multipart_alternative_non_existing_mailbox.eml"));
var result = BounceDetector.Detect(message);
Assert.True(result.IsBounce);
Assert.True(result.IsHard);
Assert.False(result.IsSoft);
Assert.Equal("5 Permanent Failure", result.PrimaryStatus.ToString());
Assert.Equal("7 Security or Policy Status", result.SecundaryStatus.ToString());
Assert.Equal("71 Delivery not authorized, message refused", result.CombinedStatus.ToString());
Assert.Null(result.RemoteMta);
Assert.Equal("mgm-smtp.example.com", result.ReportingMta);
Assert.Equal("[email protected]", result.FinalRecipient);
Assert.Null(result.UndeliveredMessageId);
Assert.IsType<TextPart>(result.DeliveryNotificationPart);
Assert.NotNull(result.DeliveryStatus);
Assert.IsType<MessagePart>(result.UndeliveredMessagePart);
Assert.NotNull(result.DiagnosticCodes);
Assert.Equal(2, result.DiagnosticCodes.Length);
Assert.Equal("4.3.2.1", result.DiagnosticCodes[0]);
Assert.Equal("does not like recipient. Remote host said: 554 5.7.1 <[email protected]>: Relay access denied Giving up on 4.3.2.1.", result.DiagnosticCodes[1]);
Assert.Equal("failed", result.Action);
}
private Stream OpenFixture(string name)
{
var type = GetType();
var assembly = type.Assembly;
return assembly.GetManifestResourceStream(type.Namespace + ".Fixtures." + name);
}
}
}