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Sending Email using hosting Mail

I am trying to send Email from my company mail , when i use this code
i got
public String SendMail(String Email)
{
try
{
var client = new SmtpClient("smtp.gmail.com",587)
{
Credentials = new System.Net.NetworkCredential("************#itsans.com", "*********"),
EnableSsl = true
};
// client.UseDefaultCredentials = false;
String VerCode = CreateRandomCode(4);
AppUserBusiness appuser = new AppUserBusiness();
String InsertVer = appuser.ForgotPassword(Email, VerCode);
if (InsertVer == "Done")
client.Send("*********#itsans.com", Email, "iBlink Verification", "Your Verification Code is :" + VerCode);
return InsertVer;
}
catch (Exception Ex)
{
Logging.WriteToFile(Ex.Message, Ex.StackTrace);
return "Fail";
}
}
{"Unable to connect to the remote server"}
{"A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 72.167.238.29:587"}

Send Mail with Outlook on Exchange Account

I want to send EMails with C# and the Microsoft.Office.Interop.Outlook library.
I am locked in, on my Outlook account with a#domain.com and got the rights on the exchange server to send mails from b#domain.com and c#domain.com.
I don't find any way to send a mail with B or C.
I got everything working for my user account which has the mail a#domain.com.
Now I can't find a way to get the account of b#domain.com and send a mail in the name of B.
My Question:
How do I get access to the other accounts?
That's the code I have:
using Outlook = Microsoft.Office.Interop.Outlook;
public static Outlook.Account GetAccountForEmailAddress(Outlook.Application application, string smtpAddress)
{
// Loop over the Accounts collection of the current Outlook session.
Outlook.Accounts accounts = application.Session.Accounts;
if (_IsDebug)
Console.WriteLine($"Anzahl Accounts: {accounts.Count}");
foreach (Outlook.Account account in accounts)
{
// When the e-mail address matches, return the account.
if (_IsDebug)
Console.WriteLine($"Account: {account.SmtpAddress}");
if (String.Compare(account.SmtpAddress, smtpAddress, true) == 0)
{
return account;
}
}
throw new System.Exception(string.Format("No Account with SmtpAddress: {0} exists!", smtpAddress));
}
static void SendEMail(string emailadress)
{
try
{
var outlookApplication = new Outlook.Application();
var outlookMailItem = (Outlook.MailItem)outlookApplication.CreateItem(Outlook.OlItemType.olMailItem);
outlookMailItem.SendUsingAccount = GetAccountForEmailAddress(outlookApplication, ConfigurationManager.AppSettings[SENDER]);
if (_IsDebug)
Console.WriteLine($"Absender: {outlookMailItem?.SendUsingAccount?.SmtpAddress}");
outlookMailItem.HTMLBody = ConfigurationManager.AppSettings[BODY];
if (_IsDebug)
Console.WriteLine($"Body: {outlookMailItem?.HTMLBody}");
var file = GetPDFFile();
if (_IsDebug)
Console.WriteLine($"File: {file?.Name}");
if (file == null)
{
Console.WriteLine("Keine Datei gefunden!");
return;
}
string attachementDisplayName = file.Name;
int attachementPosition = outlookMailItem.HTMLBody.Length + 1;
int attachementType = (int)Outlook.OlAttachmentType.olByValue;
if (_IsDebug)
Console.WriteLine($"Dateianhang: {file.FullName}");
Outlook.Attachment outlookAttachement = outlookMailItem.Attachments.Add(file.FullName, attachementType, attachementPosition, attachementDisplayName);
outlookMailItem.Subject = ConfigurationManager.AppSettings[SUBJECT];
Outlook.Recipients outlookRecipients = outlookMailItem.Recipients;
Outlook.Recipient outlookRecipient = outlookRecipients.Add(emailadress);
outlookRecipient.Resolve();
outlookMailItem.Send();
outlookRecipient = null;
outlookRecipients = null;
outlookMailItem = null;
outlookApplication = null;
if (_IsDebug)
Console.ReadLine();
}
catch (Exception)
{
throw;
}
}

You have to grant the owner of the sending mailbox Send As permissions on the mailboxes you want to send the emails from. Send on behalf of permissions will work but will say "A on behalf of B" as the sender.

Kerberos Authentication always unsuccessful

I have this code for capturing user credentials:
string domain = Domain.GetComputerDomain().ToString();
Console.WriteLine(domain);
string username =
new System.Security.Principal.WindowsPrincipal(System.Security.Principal.WindowsIdentity.GetCurrent())
.Identity.Name;
Console.WriteLine(username);
Console.Write("Password: ");
//there are far better ways to get a hidden password this was just an easy way as it's irrelevant to the point of the application, will improve
string password = null;
while (true)
{
var key = Console.ReadKey(true);
if (key.Key == ConsoleKey.Enter)
break;
password += key.KeyChar;
}
And this method for authenticating with Kerberos:
private static bool ValidateCredentialsKerberos(string username, string password, string domain)
{
var credentials
= new NetworkCredential(username, password, domain);
var id = new LdapDirectoryIdentifier(domain);
using (var connection = new LdapConnection(id, credentials, AuthType.Kerberos))
{
connection.SessionOptions.Sealing = true;
connection.SessionOptions.Signing = true;
try
{
connection.Bind();
}
catch (LdapException lEx)
{
if (ERROR_LOGON_FAILURE == lEx.ErrorCode)
{
return false;
}
throw;
}
}
return true;
}
It always throws false as incorrect credentials despite the credentials being correct. The output into the console is as follows:
Domain.net
Domain/user
Password
Any thoughts?

The problem is that new System.Security.Principal.WindowsPrincipal(System.Security.Principal.WindowsIdentity.GetCurrent()).Identity.Name; returns the username in DOMAIN\username format, whereas LdapConnection expects to see just the username (you are already sending the domain as another parameter).
You can use Environment.UserName to get just the username.
Another issue is that the ErrorCode you are checking against isn't correct. You'll get "The supplied credential is invalid." message from the DC (error code 49).
(By the way, you didn't have to create a new WindowsPrincipal, you could have just use System.Security.Principal.WindowsIdentity.GetCurrent().Name)

How to get all the messages from the Imapclient folder?

I intended to get all my messages in the Inbox folder and put them into the datagridview component.But the sentence "var message = client.Inbox.GetMessage(uids.Count - i - 1);" throws an exception:The IMAP server did not return the requested message. Is there anything wrong with my code?
//get a imapclient and connect to the server
string loginemail = UserInfo.LoginEmail;
string password = UserInfo.LoginPassword;
var client = new ImapClient();
client.Connect("imap.qq.com", 993, SecureSocketOptions.SslOnConnect);
client.Authenticate(loginemail, password);
client.Inbox.Open(FolderAccess.ReadOnly);
var uids = client.Inbox.Search(SearchQuery.All);
//get all the messages from the specified folder
for (int i = 0; i < uids.Count; i++)
{
dataGridView1.Rows.Add(1);
var message = client.Inbox.GetMessage(uids.Count - i - 1);
dataGridView1.Rows[i].Cells[0].Value = message.From.ToString();
if (message.Subject != null) { dataGridView1.Rows[i].Cells[1].Value = message.Subject.ToString(); }
else { dataGridView1.Rows[i].Cells[1].Value = ""; }
dataGridView1.Rows[i].Cells[2].Value = message.Date.ToString();
}

The only way to figure out the problem is to follow the directions in the MailKit FAQ to get a protocol log and look to see what the server is sending as a reply.

C# RunAs /Smartcard

My application used to accept username/password to authenticate to a remote share (on Windows server) and then get the file listings etc.
public int ConnectNetResource(string server, string user, string password, ref string driveLeter) {
NETRESOURCE net = new NETRESOURCE();
net.dwScope = 0;
net.dwType = 0;
net.dwDisplayType = 0;
net.dwUsage = 0;
net.lpRemoteName = server;
net.lpLocalName = driveLeter;
net.lpProvider = null;
return WNetAddConnection2(ref net, password, user, 0);
}
Now, we need to authenticate using SmartCard. I have code to GetSmartCards, but I do not know how to make use of the certificate to authenticate.
public static X509Certificate2 GetClientCertificate()
{
X509Certificate2 certificate = null;
var store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
try
{
store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
// Nothing to do if no cert found.
if (store.Certificates != null && store.Certificates.Count > 0)
{
if (store.Certificates.Count == 1)
{
// Return the certificate present.
certificate = store.Certificates[0];
}
else
{
// Request the user to select a certificate
var certificates = X509Certificate2UI.SelectFromCollection(store.Certificates, "Digital Certificates", "Select a certificate from the following list:", X509SelectionFlag.SingleSelection);
// Check if one has been returned
if (certificates != null && certificates.Count > 0)
certificate = certificates[0];
}
}
}
finally
{
store.Close();
}
return certificate;
}
GetClientCertificate function will return a user selected certificate, now HOW do I use this certificate to connect to a remote share. What API's or .dll can i use.
Btw, I am a windows engineer who can google code and make it work somehow. Will greatly appreciate a working code. Thank you.