i have a mail account on the Exchange Online service. Now i'm trying to test if i am able to send mails to customers ( on varoius domains and on Microsoft Office 365) through c# application
I tried implementing the below code but i am getting the error
"The remote certificate is invalid according to the validation
procedure."
MailMessage mail = null;
mail = new MailMessage();
string[] strToList = "abc#gmail.com"
foreach (string strID in strToList)
{
if (strID != null)
{
mail.To.Add(new MailAddress(strID));
}
}
mail.From = "demo#onmicrosoft.com";
mail.Subject = "testing"
mail.IsBodyHtml = true;
mail.Body = "mail body";
SmtpClient client = new SmtpClient("smtp.outlook.office365.com");
client.Port = 587;
client.EnableSsl = true;
client.UseDefaultCredentials = false;
NetworkCredential cred = new System.Net.NetworkCredential("demo#onmicrosoft.com", "mypassword");
client.Credentials = cred;
client.Send(mail);
Please advice if i am doing anything wrong.
Thanks a lot in advance.
this works for me ( edited from source )
ThreadPool.QueueUserWorkItem(t =>
{
SmtpClient client = new SmtpClient("smtp.office365.com",587);
client.EnableSsl = true;
client.Credentials = new System.Net.NetworkCredential("xxx#yyy.com", "password");
MailAddress from = new MailAddress("xxx#yyy.com", String.Empty, System.Text.Encoding.UTF8);
MailAddress to = new MailAddress("xxx#yyy.com");
MailMessage message = new MailMessage(from, to);
message.Body = "The message I want to send.";
message.BodyEncoding = System.Text.Encoding.UTF8;
message.Subject = "The subject of the email";
message.SubjectEncoding = System.Text.Encoding.UTF8;
// Set the method that is called back when the send operation ends.
client.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);
// The userState can be any object that allows your callback
// method to identify this send operation.
// For this example, I am passing the message itself
client.SendAsync(message, message);
});
private static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e)
{
// Get the message we sent
MailMessage msg = (MailMessage)e.UserState;
if (e.Cancelled)
{
// prompt user with "send cancelled" message
}
if (e.Error != null)
{
// prompt user with error message
}
else
{
// prompt user with message sent!
// as we have the message object we can also display who the message
// was sent to etc
}
// finally dispose of the message
if (msg != null)
msg.Dispose();
}
In some cases the TLS authentication may cause problems in using smtp.office365.com as SMTP from c#.
Try the following line before the Send(msg) statement (overriding .TargetName):
client.TargetName = "STARTTLS/smtp.office365.com";
This one works for me
This is also best way to send Mail. I have tried it in my project and working fine.
SmtpClient client = new SmtpClient("smtp.office365.com", 587);
client.EnableSsl = true;
client.Credentials = new System.Net.NetworkCredential("From#mail.com", "sdsd#12345");
MailAddress from = new MailAddress("From Address Ex From#mail.com", String.Empty, System.Text.Encoding.UTF8);
MailAddress to = new MailAddress("From Address Ex To#mail.com");
MailMessage message = new MailMessage(from, to);
message.Body = "This is your body message";
message.BodyEncoding = System.Text.Encoding.UTF8;
message.Subject = "Subject";
message.SubjectEncoding = System.Text.Encoding.UTF8;
client.Send(message);
Try smtp.office365.com instead of smtp.outlook.office365.com
Try to use:
ServicePointManager.ServerCertificateValidationCallback =
(sender, certificate, chain, sslPolicyErrors) => true;
This code will allow you to accept invalid certificates.
As Ori Nachum mention in the comment: this is a very BAD practice, and should only use for testing purposes. It is a security risk!
The Error
The SMTP server requires a secure connection or the client was not
authenticated. The server response was: 5.7.1 Client was not
authenticated
often happens when associated user account password is expired or account is locked. Try set "Never expire user password" in Active Directory, if it does not breach your company password policy :) This happened to me while testing with o365 Exchange Online A/c.
Try setting:
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
It will ensure the Service's SecurityPoint is TLS.
Please notice an answer here offered setting
ServicePointManager.ServerCertificateValidationCallback =
(sender, certificate, chain, sslPolicyErrors) => true;
May be good for testing purposes - but it's a major security risk!
Do not use with a prod account or in prod environment.
var Client = new SmtpClient("smtp.office365.com", 587);
Client.EnableSsl = true;
Client.Credentials = new System.Net.NetworkCredential("mail", "pass");
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
I successfully send mail with code
Related
The code I currently have is:
public void SendEmail(string to, string cc, string bcc, string subject, string body, string attachmentPath = "", System.Net.Mail.MailPriority emailPriority = MailPriority.Normal, BodyType bodyType = BodyType.HTML)
{
try
{
var client = new System.Net.Mail.SmtpClient();
{
client.Host = "smtp-mail.outlook.com";
client.Port = 587;
client.UseDefaultCredentials = false;
client.EnableSsl = true;
client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
client.Credentials = new NetworkCredential("[my company email]", "[my password]");
client.Timeout = 600000;
}
MailMessage mail = new MailMessage("[insert my email here]", to);
mail.Subject = subject;
mail.Body = body;
client.Send(mail);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
The email address I'm trying to send to is hosted on Office 365's Outlook. We might have to change the specific address later, but they'd likely be configured the same.
However, whenever I try to run the client.Send(mail); command, I receive the same error. The full text of the error is:
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
I've tried a few different things, like switching the port between 25 and 587, changing the host to Office365's, or toggling UseDefaultCredentials and EnableSssl to true or false. But I always see the same error. Is there something else I'm missing?
I found an example code block elsewhere on this site and replacing everything I had with it made the difference.
The function name and parameters were the same, but here's what I replaced the body of it with.
var _mailServer = new SmtpClient();
_mailServer.UseDefaultCredentials = false;
_mailServer.Credentials = new NetworkCredential("my email", "my password");
_mailServer.Host = "smtp.office365.com";
_mailServer.TargetName = "STARTTLS/smtp.office365.com";
_mailServer.Port = 587;
_mailServer.EnableSsl = true;
var eml = new MailMessage();
eml.Sender = new MailAddress("my email");
eml.From = eml.Sender;
eml.To.Add(new MailAddress(to));
eml.Subject = subject;
eml.IsBodyHtml = (bodyType == BodyType.HTML);
eml.Body = body;
_mailServer.Send(eml);
I don't know for certain but I think that replacing the Host value with the smtp Office 365 link rather than an outlook one, as well as remembering to add a Target Name which I did not have before, both did the trick and solved the authorization issue (I had previously confirmed it wasn't a credentials issue with our tech support).
I have an console app and I am trying to send mail from it.
My code.
MailMessage message = new MailMessage(MailSender, "ToMe#me.com");
message.Subject = "Using the new SMTP client.";
message.Body = #"Using this new feature, you can send an e-mail message from an application very easily.";
SmtpClient client = new SmtpClient();
client.Port = 25;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.UseDefaultCredentials = false;
client.Host = "smtp.google.com";
try
{
client.Send(message);
}
catch (Exception ex)
{
string t = ex.Message;
}
Got this from here
I must be missing something since I am getting:
Failure sending mail.
What am I doing wrong here?
EDIT:
inner Exeption.
InnerException = {"The remote name could not be resolved:
'smtp.google.com'"}
You can try to use
smtp.gmail.com
instead of
smtp.google.com
Also try to make sure that you are providing the correct credentials along with the correct port. A server parameter info:
Source
So you can try something like this
MailMessage message = new System.Net.Mail.MailMessage();
string fromEmail = "youremailaddress#xyz.com";
string password = "yourPassword";
string toEmail = "recipientemailaddress#abc.com";
message.From = new MailAddress(fromEmail);
message.To.Add(toEmail);
message.Subject = "Using the new SMTP client.";
message.Body = "Using this new feature, you can send an e-mail message from an application very easily.";
message.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
using(SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", 587))
{
smtpClient.EnableSsl = true;
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.UseDefaultCredentials = false;
smtpClient.Credentials = new NetworkCredential(fromEmail, password);
smtpClient.Send(message.From.ToString(), message.To.ToString(), message.Subject, message.Body);
}
#Ra3IDeN ...hey brother try this...
SmtpClient smtpClient = new SmtpClient("mail.yourwebsitename.com", 25);
smtpClient.Credentials = new System.Net.NetworkCredential("demo#yourwebsitename.com.com", "yourIdPassword");
smtpClient.UseDefaultCredentials = true;
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.EnableSsl = true;
MailMessage mail = new MailMessage();
//code for: From ,CC & To
mail.From = new MailAddress("demo#yourwebsitename.com", "yourwebsite");
mail.To.Add(new MailAddress("demo#yourwebsitename.com"));
mail.CC.Add(new MailAddress("youremailid#gmail.com"));
smtpClient.Send(mail);
If you're trying to send email from a console application (your higher-level problem), I recommend using PostMark. Why:
NuGet - You can get the PostMark NuGet package and send email with a nice API. Convenient and simple.
Not marked as SPAM - You can configure your "server" with verification (including spf and signing). So your email will more likely reach the destination in their inbox rather than their SPAM box.
Free - to a point. I think it's 1000 emails for free then $1 per 1000. So that's pretty good. Compare that to any other vanilla SMTP server for rent. PostMark is cheap
Consistent - From Workstation DEV to server LIVE, the PostMark API is consistently accessible. I cannot stress how good that is. Often a server host will offer SMTP server endpoint but it will only work from inside their network, meaning you have to configure another SMTP server when you're doing DEV work on your workstation (or it simply wont work).
Async Interface - I'm not sure if built-in smtp client in .Net is async...
Tracking - Hey look at that, they have a tracking feature built-in. That's snazzy.
Example code for sending (source):
var message = new PostmarkMessage()
{
To = "recipient#example.com",
From = "sender#example.com",
TrackOpens = true,
Subject = "A complex email",
TextBody = "Plain Text Body",
HtmlBody = "<html><body><img src=\"cid:embed_name.jpg\"/></body></html>",
Tag = "business-message",
Headers = new HeaderCollection{
{"X-CUSTOM-HEADER", "Header content"}
}
};
var imageContent = File.ReadAllBytes("test.jpg");
message.AddAttachment(imageContent, "test.jpg", "image/jpg", "cid:embed_name.jpg");
var client = new PostmarkClient("server token");
var sendResult = await client.SendMessageAsync(message);
MailMessage msg = new MailMessage("YourEmail#gmail.com", "DestinationEmail#something.com");
msg.Subject = message.Subject;
msg.AlternateViews.Add(AlternateView.CreateAlternateViewFromString("Message Content here as HTML", null, MediaTypeNames.Text.Html));
SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", Convert.ToInt32( 587));
System.Net.NetworkCredential credentials = new System.Net.NetworkCredential("YourEmail#gmail.com", "YourPassword");
smtpClient.EnableSsl = true;
System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate (object s,
System.Security.Cryptography.X509Certificates.X509Certificate certificate,
System.Security.Cryptography.X509Certificates.X509Chain chain,
System.Net.Security.SslPolicyErrors sslPolicyErrors)
{
return true;
};
smtpClient.Credentials = credentials;
smtpClient.Send(msg);
Good day, I'm a beginner from using ASP.net and SMTP Mailer
Heres my Question, I always encounter this Error when i send email from my local
and searched and tried the solutions around the net but not so lucky,
I hope someone point out what codes do i need and where i encounter this errror
Message = "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at"
Heres my Code:
protected void btnSendEmail_Click(object sender, EventArgs e)
{
// System.Web.Mail.SmtpMail.SmtpServer is obsolete in 2.0
// System.Net.Mail.SmtpClient is the alternate class for this in 2.0
SmtpClient smtpClient = new SmtpClient();
MailMessage message = new MailMessage();
try
{
MailAddress fromAddress = new MailAddress(txtEmail.Value, txtName.Value);
smtpClient.Credentials = new System.Net.NetworkCredential("myUser#gmail", "password");
// You can specify the host name or ipaddress of your server
// Default in IIS will be localhost
smtpClient.Host = "smtp.gmail.com";
smtpClient.EnableSsl = true;
//Default port will be 25
smtpClient.Port = 25;
smtpClient.UseDefaultCredentials = false;
//From address will be given as a MailAddress Object
message.From = fromAddress;
// To address collection of MailAddress
message.To.Add("myEmail#gmail.com");
message.Subject = txtSubject.Value;
// CC and BCC optional
// MailAddressCollection class is used to send the email to various users
// You can specify Address as new MailAddress("admin1#yoursite.com")
message.CC.Add("myEmail#gmail.com");
// You can specify Address directly as string
message.Bcc.Add(new MailAddress("myEmail#gmail.com"));
//Body can be Html or text format
//Specify true if it is html message
message.IsBodyHtml = false;
// Message body content
message.Body = txtaMessage.Value;
message.BodyEncoding = System.Text.Encoding.UTF8;
message.HeadersEncoding = System.Text.Encoding.UTF8;
// Send SMTP mail
smtpClient.Send(message);
lblSuccess.Text = "Email successfully sent.";
}
catch (Exception ex)
{
lblSuccess.Text = "Send Email Failed.";
}
}
i tried to make a simple codes for sending email try this
MailMessage mm = new MailMessage();
mm.From = new MailAddress("fromEmail");
mm.To.Add("toEmail");
mm.CC.Add("ccEmail");
mm.Subject = "StringSubject";
mm.Body = "BodySubject";
mm.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.EnableSsl = true;
System.Net.NetworkCredential NetworkCred = new System.Net.NetworkCredential();
NetworkCred.UserName = "UsernameString";
NetworkCred.Password = "PasswordString";
smtp.UseDefaultCredentials = true;
smtp.Credentials = NetworkCred;
smtp.Port = 587;
try
{
smtp.Send(mm);
}
catch (Exception)
{
}
Try this reference ASP Simple SMTP for C# and VB it helps me a lot for may smtp problem
Please have a look on google support team, what they are saying regarding sending mail from application.
https://support.google.com/mail/answer/78775?hl=en
Also following link can help you.
Gmail Error :The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required
Goto Account of Gmail , then select
Connected apps & sites
Allow less secure apps: ON(if this is off you cannot send mails through apps,or your websites )
I'm trying to make an email page section and I found an article and one of the answer in this forum which I used in my codes below but its still saying failure sending mail which I could hardly figure out why?. I need assistance in finding a remedy why my codes below fails to send an email. Here my codes below for your reference. Please advise...Thanks.
protected void Button1_Click(object sender, EventArgs e)
{
SmtpClient client = new SmtpClient();
client.Host = "smtp.live.com"; //Im not sure about this,I just copy it from the article
client.Port = 4548; //This is my ASP.Net Development Server Port,Im not sure also if this is correct.
client.Credentials = new System.Net.NetworkCredential(
#"email_account",
#"email_password"); //Im not sure about this code if this correct, I just copy it
client.EnableSsl = true;
// create message
MailMessage message = new MailMessage();
message.From = new MailAddress(TextBox4.Text, "Mackmellow"); //Textbox4 is my email address
message.To.Add(new MailAddress(TextBox1.Text, "Mackmellow")); // Textbox1 is the email add I want to send
message.Subject = TextBox2.Text; //Textbox2 is my subject
message.Body = TextBox3.Text; // Textbox3 is my message
message.BodyEncoding = System.Text.Encoding.UTF8;
message.IsBodyHtml = true;
message.SubjectEncoding = System.Text.Encoding.UTF8;
// send message
try
{
client.Send(message);
}
catch (SmtpException ex)
{
Response.Write(ex.Message);
}
finally
{
// Clean up.
message.Dispose();
}
Can please correct my codes and tell me what I'm missing? Thanks in advance...
For sending mail you can't use your development server port.
You have to use the smtp server port of your mail server.
for smtp.live.com you should use either port 25 or 587
For this code below, specify VALID login details (email/password)
client.Credentials = new System.Net.NetworkCredential(
#"email_account",
#"email_password");
Provide only G-mail Account Id.Then check it . I think SmtpClient Does not accept any other domain mail address . So you can put only gmail address then check it .
Edit
See this sample's and other answers .
Error sending mail from Asp.Net/C#
how to send email in asp.net to any destination eg yahoo,gmail,hotmail etc c# code
Try this.
SmtpClient SmtpServer = new SmtpClient("smtp.live.com");
var mail = new MailMessage();
mail.From = new MailAddress("email#hotmail.com");
mail.To.Add("ToGmail.com");
mail.Subject = "Your Sub";
mail.IsBodyHtml = true;
string htmlBody;
htmlBody = "HTML code";
mail.Body = htmlBody;
SmtpServer.Port = 587;
SmtpServer.UseDefaultCredentials = false;
SmtpServer.Credentials = new System.Net.NetworkCredential("email#hotmail.com", "YourPassword");
SmtpServer.EnableSsl = true;
SmtpServer.Send(mail);
I use this code to try and send an email. After a few seconds, it shows me an error message claiming the operation has timed out. How can I resolve this issue?
try
{
MailAddress from = new MailAddress("from#yahoo.com", "name", Encoding.UTF8);
MailAddress to = new MailAddress("to#yahoo.com");
MailMessage message = new MailMessage(from, to);
message.Subject = "Test";
message.SubjectEncoding = Encoding.UTF8;
message.Body = "Test";
message.BodyEncoding = Encoding.UTF8;
SmtpClient client = new SmtpClient();
client.Host = "smtp.mail.yahoo.com";
client.Port = 465;
client.EnableSsl = true;
client.Credentials = new NetworkCredential("example#yahoo.com", "Password");
client.Send(message);
MessageBox.Show("sending Successfully!!!");
}
catch (SmtpException ex)
{
MessageBox.Show(ex.ToString());
}
Are you sure that you can reach smtp.mail.yahoo.com on port 465? Sounds pretty much like a network related issue. Generally when something times out, it means that it tries to connect to the server for a certain amount of time and them stops and gives you an error.
One easy way to test this is to telnet to smtp.mail.yahoo.com on port 465 and see if it times out. You can use Putty or the built in telnet-client in windows, if you have it installed.
As per my understanding, your code won't work because yahoo.com does not provide you access via SMTP. For that you need to upgrade to Yahoo! Mail Plus.
Couldn't find any sort of kb from Yahoo! on this. I got the information from a Yahoo! article on How to read Yahoo! Mail Plus using Outlook Express. The first two lines of the article are very relevant.
Do you want to read and send your Yahoo! email with Outlook Express?
If you are a Yahoo! Mail Plus user you can.
And also, the outgoing SMTP server should be
client.Host = "plus.smtp.mail.yahoo.com";
i had the same problem
you have to set the clietn.port as 25 and you have to specify your login an password in client.Credentials = new NetworkCredential(login,password)
when i did that i can send mail without problem
there is the code
{
SmtpClient client = new SmtpClient("188.125.69.59");//you can put the ip adress or the dns of smtp server (smtp.mail.yahoo.com as exemple)
// Specify the e-mail sender.
// Create a mailing address that includes a UTF8 character
// in the display name.
MailAddress from = new MailAddress("from#yahoo.fr");
// Set destinations for the e-mail message.
MailAddress to = new MailAddress("to#gmail.com");
// Specify the message content.
MailMessage message = new MailMessage(from, to);
message.Body = "This is a test e-mail message sent by an application. ";
// Include some non-ASCII characters in body and subject.
string someArrows = new string(new char[] {'\u2190', '\u2191', '\u2192', '\u2193'});
message.Body ="cc";
message.BodyEncoding = System.Text.Encoding.UTF8;
message.Subject = "test message 1";
message.SubjectEncoding = System.Text.Encoding.UTF8;
string userState = "test message1";
MessageBox.Show("sending");
client.Port = 25;
// client.Timeout = 40000;
client.ServicePoint.MaxIdleTime = 1;
client.Credentials = new System.Net.NetworkCredential("from#yahoo.fr", "pass");
//client.SendAsync(message, userState);
client.Send(message);
MessageBox.Show("Sending message... press c to cancel mail. Press any other key to exit.");
string answer = Console.ReadLine();
// If the user canceled the send, and mail hasn't been sent yet,
// then cancel the pending operation.
// if (answer.StartsWith("c") && mailSent == false)
//{
// client.SendAsyncCancel();
//}
// Clean up.
message.Dispose();
MessageBox.Show("Goodbye.");
}
Use following setting for domain #yahoo.co.in.
var smtp = new System.Net.Mail.SmtpClient();
{
smtp.Host ="smtp.mail.yahoo.co.in";
smtp.Port = 25;
smtp.EnableSsl = true;
smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
smtp.Timeout = 20000;
}