I create a method for send Email like:
public async Task SendEmailCC(string body, string subject, List<string> mainRecievers, List<string> receivers)
{
SmtpClient client = new SmtpClient("smtp-mail.outlook.com")
{
UseDefaultCredentials = true,
Port = 587,
EnableSsl = true,
DeliveryMethod = SmtpDeliveryMethod.Network,
Credentials = new NetworkCredential("Test#gmail.com", "MyMailPassword")
};
MailMessage mailMessage = new MailMessage { From = new MailAddress("job#test.org") };
foreach (var reciever in mainRecievers)
{
mailMessage.To.Add(reciever);
}
foreach (var item in receivers)
{
mailMessage.CC.Add(item);
}
mailMessage.Body = body;
mailMessage.IsBodyHtml = true;
mailMessage.Subject = subject;
await client.SendMailAsync(mailMessage);
}
For test, I send an email to my self, but I didn't get Email. how can I find my problem?
Indeed I don't like answer my question but I found that.
My mail server was google and I used of OutLookSmtp,To this section of my code I have that and I changed. like:
SmtpClient client = new SmtpClient("smtp-mail.outlook.com")
changed to:
SmtpClient client = new SmtpClient("smtp.gmail.com")
After that I get this exception:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required", than the error might occur due to following cases.
For this issue I try this:
case 1: when the password is wrong
case 2: when you try to login from some App
case 3: when you try to login from the domain other than your time zone/domain/computer (This is the case in most of scenarios when sending mail from code)
There is a solution for each
solution for case 1: Enter the correct password.
solution 1 for case 2: go to security settings at the followig link https://www.google.com/settings/security/lesssecureapps and enable less secure apps . So that you will be able to login from all apps.
solution 2 for case 2:(see https://stackoverflow.com/a/9572958/52277) enable two-factor authentication (aka two-step verification) , and then generate an application-specific password. Use that newly generated password to authenticate via SMTP.
solution 1 for case 3: (This might be helpful) you need to review the activity. but reviewing the activity will not be helpful due to latest security standards the link will not be useful. So try the below case.
solution 2 for case 3: If you have hosted your code somewhere on production server and if you have access to the production server, than take remote desktop connection to the production server and try to login once from the browser of the production server. This will add excpetioon for login to google and you will be allowed to login from code.
But what if you don't have access to the production server. try the solution 3
solution 3 for case 3: You have to enable login from other timezone / ip for your google account.
to do this follow the link https://g.co/allowaccess and allow access by clicking the continue button.
And that's it. Here you go. Now you will be able to login from any of the computer and by any means of app to your google account
I have a problem: I need to connect from a remote server to Active Directory, but the code has to be using the LdapConnection class. I need this because that way I can only test change notifiers when some event happen (such as user is deactivated or he changed group, data etc). OS on the remote server is Windows Server 2012.
I managed to do this from local using DirectoryServices with the following code:
String ldapPath = "LDAP://XRMSERVER02.a24xrmdomain.info";
directoryEntry = new DirectoryEntry(ldapPath, #"A24XRMDOMAIN\username", "pass");
//// Search AD to see if the user already exists.
DirectorySearcher search = new DirectorySearcher(directoryEntry);
search.Filter = "(&(objectClass=user))";
SearchResult result = search.FindOne();
This is okay and connection works but now I need to connect using the LdapConnection class.
I tried something like this on many ways but none of that helped me:
LdapConnection connection = new LdapConnection(XRMSERVER02.a24xrmdomain.info);
var credentials = new NetworkCredential(#"A24XRMDOMAIN\username", "pass");
connection.Credential = credentials;
connection.Bind();
It says that credentials are invalid but that is not true.
Explanations:
XRMSERVER02 - Domain controller
a24xrmdomain.info - Domain
A24XRMDOMAIN - Domain used for logging
Thanks for your help.
Even though I solved my problem I want to share with other developers what I achieved so far. Problem that I encountered was that I had remote server with OS Windows server 2012 and Active directory on it. I needed to connect on him via my local machine(Windows 10).
As I stated in my question it is possible to do that via DirectoryServices with the following code:
String ldapPath = "LDAP://(DomainController).a24xrmdomain.info";
directoryEntry = new DirectoryEntry(ldapPath, #"DOMAIN\username","pass");
//// Test search on AD to see if connection works.
DirectorySearcher search = new DirectorySearcher(directoryEntry);
search.Filter = "(&(objectClass=user))";
SearchResult result = search.FindOne();
This is one of the solutions, but since my task was to get notification and to identify when ever some object has changed in Active Directory, I needed connection to Active Directory on Remote server via LDAP class. Code for getting notifiers is taken from:
- Registering change notification with Active Directory using C#
I succeeded to connect with LDAP class via next code:
String ldapPath2 = "(DomainController).a24xrmdomain.info";
LdapConnection connection = new LdapConnection(ldapPath2);
var credentials = new NetworkCredential(#"username", "pass");
connection.Credential = credentials;
connection.Bind();
Want to mention that no IP address of remote server is needed, just Domain Controller that is used on him, and that Domain used for logging is unnecessary.
Happy coding
Try using NetworkCredential constructor with 3 parameters: username, password and domain. Specify domain separately from user name
I have to send mails using my web application. Given the below code showing The SMTP server requires a secure connection or the client was not authenticated. The server response was:
5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM.
Help me to find a proper solution. Thank you.
Code:
protected void btnsubmit_Click(object sender, EventArgs e)
{
Ticket_MailTableAdapters.tbl_TicketTableAdapter tc;
tc = new Ticket_MailTableAdapters.tbl_TicketTableAdapter();
DataTable dt = new DataTable();
dt = tc.GetEmail(dpl_cate.SelectedValue);
foreach (DataRow row in dt.Rows)
{
string eml = (row["Emp_Email"].ToString());
var fromAddress = "emailAddress";
var toAddress = eml;
const string fromPassword = "*****";
string body = "Welcome..";
// smtp settings
var smtp = new System.Net.Mail.SmtpClient();
{
smtp.Host = "smtp.office365.com";
smtp.Port = 587;
smtp.EnableSsl = true;
smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
smtp.UseDefaultCredentials = false;
smtp.Timeout = 600000;
}
// Passing values to smtp object
smtp.Send(fromAddress, toAddress, subject, body);
}
}
}
#Reshma- In case you have not figured it yet, here are below things that I tried and it solved the same issue.
Make sure that NetworkCredentials you set are correct. For example in my case since it was office SMTP, user id had to be used in the NetworkCredential along with domain name and not actual email id.
You need to set "UseDefaultCredentials" to false first and then set Credentials. If you set "UseDefaultCredentials" after that it resets the NetworkCredential to null.
Hope it helps.
You seem to be passing the From address as emailAddress, which is not a proper email address. For Office365 the From needs to be a real address on the Office365 system.
You can validate that if you hardcode your email address as the From and your Office 365 password.
Don't leave it there though of course.
I spent way too much time on this and the solution was super simple.
I had to use my "MX" as the host and port 25.
var sClient = new SmtpClient("domain-com.mail.protection.outlook.com");
var message = new MailMessage();
sClient.Port = 25;
sClient.EnableSsl = true;
sClient.Credentials = new NetworkCredential("user", "password");
sClient.UseDefaultCredentials = false;
message.Body = "Test";
message.From = new MailAddress("test#test.com");
message.Subject = "Test";
message.CC.Add(new MailAddress("dude#good.com"));
sClient.Send(message);
I use to have the same problem.
Add the domain solved it..
mySmtpClient.Credentials = New System.Net.NetworkCredential("email#domain.com", "password", "domain.com")
In my case, 2 Factor Authentication was turned on for the FROM account in Office 365. Once that was turned off, the email sent successfully.
Main two reasons only as mentioned in above comments
NetworkCredentials you set should be correct. Verify with try actually signing into the account.
You need to set UseDefaultCredentials to false first and then set Credentials
Or
Put smtp.UseDefaultCredentials = false; above the smtp.Credentials assignment.
In my case, I followed the following 3 steps and it worked.
If you are getting one of the following errors:
535 5.7.3 Authentication unsuccessful
5.7.57 Client not authenticated to send mail
There are a few things you should check:
Enable Client SMTP submission on the licensed mailbox being used:
From Microsoft 365 Admin Center, go to Active Users and select the user.
Go to the Mail tab.
In the Email apps section, select Manage email apps.
Verify that the Authenticated SMTP setting is checked (enabled).
Select Save changes.
Disable Multi-Factor Authentication (MFA) on the licensed mailbox being used:
In the Microsoft 365 admin center, in the left navigation menu, choose Users > Active users.
On the Active user's page, choose Multi-Factor Authentication.
On the Multi-Factor Authentication page, select the user and disable the Multi-Factor Authentication status.
Disable the Azure Security Defaults by toggling the Enable Security Defaults to No:
Sign in to the Azure portal as a Security administrator, Conditional Access administrator, or Global administrator.
Browse to Azure Active Directory > Properties.
Select Manage security defaults.
Set the Enable security defaults to toggle to No.
Select Save.
Microsoft Reference Link
This is an old question but since this is the first result in google for this error, I thought I would update my progress in this issue.
I spent way too may hours on this issue. In the end I had to change my Office 365 account's password few times until my code succeeded in sending emails.
Didn't have to make any changes in code.
If you are using office 365 follow this steps:
check the password expiration time using Azure power shell :Get-MsolUser -All | select DisplayName, LastPasswordChangeTimeStamp
Change the password using a new password (not the old one). You can eventually go back to the old password but you need to change it twice.
Hope it helps!
Probably the password of the account that you trying to send e-mail is expired. Just check your password policy expire date.
In my case I was using the MailMessage constructor that takes two strings (to, from) and getting the same error. When I used the default constructor and then added a MailAddress object to the To property of the MailMessage it worked fine.
If you reorder your code this way, it should work:
SmtpClient client = new SmtpClient();
client.UseDefaultCredentials = false;
client.Credentials = new System.Net.NetworkCredential(mailOut, pswMailOut);
client.Port = 587; // 25 587
client.Host = "smtp.office365.com";
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.EnableSsl = true;
MailMessage mail = new MailMessage();
mail.From = new MailAddress(mailOut, displayNameMailOut);
mail.To.Add(new MailAddress(mailOfTestDestine));
mail.Subject = "A special subject";
mail.Body = sb.ToString();
client.Send(mail);
I changed the Office365 password and then tried to send a test email and it worked like a charm for me.
I used the front end (database mail option) and settings as smtp.office365.com port number 587 and checked the secure connection option. use basic authentication and store the credentials. Hope this turns out useful for someone.
In my situation, our IT department made MFA mandatory for our domain. This means we can only use option 3 in this Microsoft article to send email. Option 3 involves setting up an SMTP relay using an Office365 Connector.
Try resetting your password for the email used. Had similar issue, and got it fixed only after changing password.
I had similar issue. please read this microsoft support article.
specially this section.
For us it failed this way but only from the servers (Azure) not from the developer machines.
It turned out that the Office365 admin required MFA when accessing office365 from outside of the corporate country.
Our production server was in Ireland but the dev machines where in Sweden -> confusion... The admin turned of MFA for our sending account -> works.
Started working after adding property:
mail.smtp.starttls.enable=true
Using:
mail.smtp.host=smtp.office365.com
mail.smtp.port=587
mail.transport.protocol=smtp
mail.smtp.auth=true
mail.smtp.starttls.enable=true
mail.smtp.user=xxx#example.com
mail.smtp.password=xxx
mail.smtp.from=yyy#example.com
Set the User default credentials to true:
smtp.UseDefaultCredentials = True;
Before that, input your credential:
smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
This should work fine.
I am analyzing a users Exchange mailbox with calls to the ExchangeService. This tool needs to run on the client environment periodically and by ommiting the credentials to the service I am connecting to the Exchange Service as the logged in Windows User. I can succesfully loop thrue the folders and items.
Now I want tot retrieve the information about the mailbox being used. Username and (main) E-mail should suffice. But I cannot find anything about how to retrieve this information. Every example provides credentails for the user, or auto-discovering the Exchange service from the e-mail adres. I do not want the user to configure anything :-).
Any suggestions?
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);
service.Url = new Uri("https://FQDN/EWS/Exchange.asmx");
???
FindItemsResults<Item> findResults = service.FindItems(WellKnownFolderName.SentItems, new ItemView(100)); // this works
I've tried using service.ResolveName, but that can give multiple answers, even using Environment.UserName
The easiest method to do this is to use ConvertId operation and use unresolvable address (blah#blah.com always works for me) in the Mailbox element. Exchange should convert this to the actual Mailbox in the response. eg
Folder chk = Folder.Bind(service, WellKnownFolderName.Inbox);
AlternateId aiItem = new AlternateId();
aiItem.Mailbox = "Blah#Blah.com";
aiItem.UniqueId = chk.Id.UniqueId;
aiItem.Format = IdFormat.EwsId;
String CasServer = service.Url.Host.ToString();
AlternateIdBase caid = service.ConvertId(aiItem, IdFormat.HexEntryId);
Console.WriteLine(((AlternateId)caid).Mailbox);
Cheers
Glen
I have read other answers on the stackoverflow. but none of the solutions work for me.
I'm trying to send email through live.com, but unable to it.
The error message:
mailbox unavailable. The server response was: 5.7.3 requested action aborted;
user not authenticated
or error message:
System.Net.Mail.SmtpException: Service not available,
closing transmission channel.
The server response was: Cannot connect to SMTP server 65.55.176.126
(65.55.176.126:587), NB connect error 1460
The code:
MailMessage mail = new MailMessage();
mail.From = new MailAddress("email#live.com");
mail.To.Add("someone#someone.com");
mail.Subject = "hello";
mail.Body = "awefkljj kawefl";
mail.IsBodyHtml = false;
SmtpClient smtp = new SmtpClient("smtp.live.com", 587);
smtp.EnableSsl = true;
smtp.Credentials = new NetworkCredential("email#live.com", "password");
smtp.Send(mail);
Are you able to send the email by using above code?
It works before, last year, but it is no more working now.
I'm not sure what has been changed to live.com email server.
What new settings or parameters should apply?
I ran into an issue where I was unable to send emails using the smtp.live.com SMTP server from certain hosts -- particulary Azure hosts. In my case, the SMTP attempt was from a host that I had never used to sign-in previously, so the attempt was blocked with the 5.7.3 error:
Mailbox unavailable. The server response was: 5.7.3 requested action aborted; user not authenticated
The solution was to browse to the account settings, locate the SMTP request in its recent activity, and select "This was me":
Tested and it works (different host address and a few other property set):
using (var client = new SmtpClient("smtp-mail.outlook.com")
{
Port = 587,
DeliveryMethod = SmtpDeliveryMethod.Network,
UseDefaultCredentials = false,
EnableSsl = true,
Credentials = new NetworkCredential(_sender, _password)
})
{
using (var mail = new MailMessage(_sender, _recipient)
{
Subject = _subject,
Body = _message
})
{
client.Send(mail);
}
}
Also, if the account has two-step verification turned on, you'll have to generate an app password and use that instead.
Your code works for me without any changes with a live.com address. I am able to generate the same exception by simply putting an incorrect password.
I would suggest following checks:
Did the user change password recently? Are you able to login with the credentials provided over the web interface?
if yes, does your program uses the exact same credentials? please note that white space can be your enemy.