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Retrieve unread emails and leave them as unread in inbox

I'm using GemBox.Email and I'm retrieving unread emails from my inbox like this:
using (var imap = new ImapClient("imap.gmail.com"))
{
imap.Connect();
imap.Authenticate("username", "password");
imap.SelectInbox();
IEnumerable<string> unreadUids = imap.ListMessages()
.Where(info => !info.Flags.Contains(ImapMessageFlags.Seen))
.Select(info => info.Uid);
foreach (string uid in unreadUids)
{
MailMessage unreadEmail = imap.GetMessage(uid);
unreadEmail.Save(uid + ".eml");
}
}
The code is from the Receive example, but the problem is that after retrieving them they end up being marked as read in my inbox.
How can I prevent this from happening?
I want to download them with ImapClient and leave them as unread on email server.

EDIT (2021-01-19):
Please try again with the latest version from the BugFixes page or from NuGet.
The latest version provides ImapClient.PeekMessage methods which you can use like this:
using (var imap = new ImapClient("imap.gmail.com"))
{
imap.Connect();
imap.Authenticate("username", "password");
imap.SelectInbox();
foreach (string uid in imap.SearchMessageUids("UNSEEN"))
{
MailMessage unreadEmail = imap.PeekMessage(uid);
unreadEmail.Save(uid + ".eml");
}
}
ORIGINAL:
When retrieving an email, most servers will mark it with the "SEEN" flag. If you want to leave an email as unread then you can just remove the flag.
Also, instead of using ImapClient.ListMessages you could use ImapClient.SearchMessageUids to get IDs of unread emails.
So, try the following:
using (var imap = new ImapClient("imap.gmail.com"))
{
imap.Connect();
imap.Authenticate("username", "password");
imap.SelectInbox();
// Get IDs of unread emails.
IEnumerable<string> unreadUids = imap.SearchMessageUids("UNSEEN");
foreach (string uid in unreadUids)
{
MailMessage unreadEmail = imap.GetMessage(uid);
unreadEmail.Save(uid + ".eml");
// Remove "SEEN" flag from read email.
imap.RemoveMessageFlags(uid, ImapMessageFlags.Seen);
}
}

How can I detect if my fetched email is bounced or not

I fetched emails from servers by using IMAP or POP3 and entered the fetched emails to database but I noticed there are a lot of bounced emails entered to the system so I searched a lot on google to check fetched email and if it's bounced email I'll not enter it to the system and I found library BounceDetectResult to detect if email is bounced or not but this library working only with message type MimeMessage so It's useful when I use IMAP but it's not work with message type OpenPop.Mime.Message so I can't use It when I use POP3
var result= BounceDetectorMail.Detect(message);//message type MimeMessage
if (result.IsBounce)
{
em.DelivaryFailure = true;
}
so my problem I didn't find way to detect if my retrieved message is bounced or not when I use pop3 in retrieving

It looks like the MailBounceDetector library that you mentioned uses my MimeKit library to detect if a message is a bounced message or not.
The good news is that you can use that library because I also have a library that does POP3 called MailKit, so you can use that instead of OpenPOP.NET.

For any who may need, from Bounce inspector software library, supports both POP3 and IMAP:
// POP3 server information.
const string serverName = "myserver";
const string user = "name#domain.com";
const string password = "mytestpassword";
const int port = 995;
const SecurityMode securityMode = SecurityMode.Implicit;
// Create a new instance of the Pop3Client class.
Pop3Client client = new Pop3Client();
Console.WriteLine("Connecting Pop3 server: {0}:{1}...", serverName, port);
// Connect to the server.
client.Connect(serverName, port, securityMode);
// Login to the server.
Console.WriteLine("Logging in as {0}...", user);
client.Authenticate(user, password);
// Initialize BounceInspector.
BounceInspector inspector = new BounceInspector();
inspector.AllowInboxDelete = false; // true if you want BounceInspector automatically delete all hard bounces.
// Register processed event handler.
inspector.Processed += inspector_Processed;
// Download messages from Pop3 Inbox to 'c:\test' and process them.
BounceResultCollection result = inspector.ProcessMessages(client, "c:\\test");
// Display processed emails.
foreach (BounceResult r in result)
{
// If this message was identified as a bounced email message.
if (r.Identified)
{
// Print out the result
Console.Write("FileName: {0}\nSubject: {1}\nAddress: {2}\nBounce Category: {3}\nBounce Type: {4}\nDeleted: {5}\nDSN Action: {6}\nDSN Diagnostic Code: {7}\n\n",
System.IO.Path.GetFileName(r.FilePath),
r.MailMessage.Subject,
r.Addresses[0],
r.BounceCategory.Name,
r.BounceType.Name,
r.FileDeleted,
r.Dsn.Action,
r.Dsn.DiagnosticCode);
}
}
Console.WriteLine("{0} bounced message found", result.BounceCount);
// Disconnect.
Console.WriteLine("Disconnecting...");
client.Disconnect();

Find emails by message Id using using IMAP and MailSystem.NET

I'm using IMAP and MailSystem.NET to read emails in c#. How do I search emails by message id? (msg.MessageId)
using (Imap4Client imap = new Imap4Client()){
imap.ConnectSsl(protocol, port);
imap.LoginFast(email, password);
Mailbox inbox = imap.SelectMailbox("INBOX");
int[] mails= inbox.Search("UNSEEN");
for (int i = 0; i < mailsUnread.Length; i++) {
Message msg = inbox.Fetch.MessageObject(mailsUnread[i]);
string subject = msg.Subject;
string body = msg.BodyText.Text;
string messageId= msg.MessageId;
}
}
Thanks

I would highly recommend using MailKit instead as it is a much much much more robust IMAP client library than MailSystem.NET... but...
The way you would search for messages based on the Message-Id header in MailSystem.NET is:
int[] mails = inbox.Search (string.Format ("HEADER \"MESSAGE-ID\" \"{0}\"", msg.MessageId));
Hope that helps.

Sending email to multiple recipients via Google

I am working on an C# project where I am building my own SMTP server. It is basically working but I am now trying to get multiple recipients being sent but I am receiving an error.
I am getting the MX record from the senders domain and I am then using MX Record to try and send an email to multiple recipients. If I do two recipients with the same domain it works fine, if the two recipients have different domains, I then get the following response:
Failed to send email. General Exception: Error in processing. The server response was: 4.3.0 Multiple destination domains per transaction is unsupported. Please
There is nothing after please that's the end of the response.
Below is how I am getting the MX Record:
string[] mxRecords = mxLookup.getMXRecords(Classes.CommonTasks.getDomainFromEmail(domain));
public string[] getMXRecords(string domain)
{
DnsLite dl = new DnsLite(library);
ArrayList dnsServers = getDnsServers();
dl.setDnsServers(dnsServers);
ArrayList results = null;
string[] retVal = null;
results = dl.getMXRecords(domain);
if (results != null)
{
retVal = new string[results.Count];
int counter = 0;
foreach (MXRecord mx in results)
{
retVal[counter] = mx.exchange.ToString();
counter++;
}
}
return retVal;
}
Below is how I am sending the email.
if (mxRecords != null)
{
MailMessage composedMail = new MailMessage();
composedMail.From = new MailAddress(message.EmailFromAddress);
//MailAddressCollection test = new MailAddressCollection();
//composedMail.To = test;
composedMail = addRecipientsToEmail(composedMail, message.emailRecipients);
composedMail.Subject = message.subject;
composedMail.Body = message.EmailBody;
if (message.contentType.ToString().Contains("text/html"))
{
composedMail.IsBodyHtml = true;
}
SmtpClient smtp = new SmtpClient(mxRecords[0]);
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Port = 25;
if (Configuration.emailConfig.useSmtpMaxIdleTime)
{
smtp.ServicePoint.MaxIdleTime = 1;
}
library.logging(methodInfo, string.Format("Sending email via MX Record: {0}", mxRecords[0]));
smtp.Send(composedMail);
updateEmailStatus(message.emailID, EmailStatus.Sent);
library.logging(methodInfo, string.Format("Successfully sent email ID: {0}", message.emailID));
}
else
{
string error = string.Format("No MX Record found for domain: {0}", domain);
library.logging(methodInfo, error);
library.setAlarm(error, CommonTasks.AlarmStatus.Warning, methodInfo);
}
This looks as if it is something that Google is restricting from being done but I can't find a way to work around out, other than to send the emails separately for each recipient.
If it's of any use, the two domains are google app domains.
Thanks for any help you can provide.

It seems you are not alone. Check this out.
:
"Based on my investigation and research, I believe what's happening is your system is connecting directly to the delivery server (aspmx.l.google.com). As this is the delivery server, it does not allow:
Delivery to accounts that are not provisioned on Google (i.e., unauthenticated relaying).
Delivery to multiple different domains within the same SMTP session.
The second one is the one that is important to us. As of the beginning of this month(May2012), adjustments were made to our server settings that mean that our delivery server is strictly enforcing the multiple-domain-not-allowed rule. There are two ways to get around this. The first is to send to separate domains on separate smtp sessions, and the second is to use smtp.gmail.com in place of aspmx.l.google.com."
http://productforums.google.com/forum/#!topic/apps/jEUrvTd1S_w

Sine you can send an email with a single recipient through google your issue is not in resolving the mx-record. The Mx record tells an IP-address but doesn't tell about the functionality/behavior of the service behind that ip.
You can resolve the mx-record, so far so good. But you don't need to to resolve the mx on your own as the smtp-client does it on your behalve, just supllying the hostname will do. But note that this was a great excersise to learn more about DNS. No time waste :-)
As far as I recall, sending mail through google in the way you intend you need a google account. Authenticate with the smtp-server with the credentials for that account can open a new perspective

Transfer content of email to C# page

I have created one web-form that contains controls to add name, date of birth, gender info of user with add button, once add button clicked that info goes to database.
But i have my mailbox, for eg. gmail some mails are coming in inbox that contains info same as earlier(Name, Date of birth, gender etc.). So can i have functionality to transfer that inbox data to my database?

Yes - you can.
There are a lot of libraries that you can leverage to make it trivial to check a Gmail account. Here is just one: http://sourceforge.net/projects/hpop/
Here is sample code for fetching all of your e-mails:
public static List<Message> FetchAllMessages(string hostname, int port, bool useSsl, string username, string password)
{
// The client disconnects from the server when being disposed
using (Pop3Client client = new Pop3Client())
{
// Connect to the server
client.Connect(hostname, port, useSsl);
// Authenticate ourselves towards the server
client.Authenticate(username, password);
// Get the number of messages in the inbox
int messageCount = client.GetMessageCount();
// We want to download all messages
List<Message> allMessages = new List<Message>(messageCount);
// Messages are numbered in the interval: [1, messageCount]
// Ergo: message numbers are 1-based.
// Most servers give the latest message the highest number
for (int i = messageCount; i > 0; i--)
{
allMessages.Add(client.GetMessage(i));
}
// Now return the fetched messages
return allMessages;
}
}
You'll still need to go through each one and determine if it's valid for your database and then grab the data and insert it into the database; but it should be pretty straight-forward (and almost identical to what you are already doing)
For GMail you can use the following to get your mail:
List<Message> myMail = FetchAllMessages("pop.gmail.com", 995, true, "MyEmail#gmail.com", "mysupersecretpasswordshhhhh!");