I'm developing a third-party add-on to run in a program called M-Files.
The purpose of the add-on is to send a mail with the help of an SMTP server. I created a fake SMTP server in DevelMail.com just for testing.
Testing the SMTP server from a browser works but when i run the code it gives me the following error.
Transaction failed. The server response was: 5.7.1 Client host rejected: Access denied
Here are the SMTP information:
Host: smtp.develmail.com
SMTP Port: 25
TLS/SSL Port: 465
STARTTLS Port : 587
Auth types: LOGIN, CRAM-MD5
Here is the code:
MailAddress adressFrom = new MailAddress("notification#mfiles.no", "M-Files Notification Add-on");
MailAddress adressTo = new MailAddress("majdnakhleh#live.no");
MailMessage message = new MailMessage(adressFrom, adressTo);
message.Subject = "M-Files Add-on running";
string htmlString = #"<html>
<body>
<p> Dear customer</p>
<p> This is a notification sent to you by using a mailadress written in a metadata property!.</p>
<p> Sincerely,<br>- M-Files</br></p>
</body>
</html>
";
message.Body = htmlString;
SmtpClient client = new SmtpClient();
client.Host = "smtp.develmail.com";
client.Port = 587;
client.Credentials = new System.Net.NetworkCredential("myUserName", "myPassword");
client.EnableSsl = true;
client.Send(message);
Reason for the Issue:
Usually, email sending option using SMTP encountered Access denied
because there should have a sender email which required to allow
remote access. When SMTP request sent from the sender email
it checks whether there is remote access allowed. If no, then you
always got Access denied message.
Solution:
For example let's say, you want to send email using Gmail SMTP in that case you do have to enable Allow less secure apps: ON
How To Set
You can simply browse this link Less secure app access and turn that to ON
See the screen shot
Code Snippet:
public static object SendMail(string fromEmail, string toEmail, string mailSubject, string mailBody, string senderName, string senderPass, string attacmmentLocationPath)
{
try
{
MailMessage mail = new MailMessage();
//Must be change before using other than gmail smtp
SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
mail.From = new MailAddress(fromEmail);
mail.To.Add(toEmail);
mail.Subject = mailSubject;
mail.Body = mailBody;
mail.IsBodyHtml = true;
SmtpServer.Port = 587;
SmtpServer.Credentials = new System.Net.NetworkCredential(senderName, senderPass);//Enter the credentails from you have configured earlier
SmtpServer.EnableSsl = true;
SmtpServer.Send(mail);
return true;
}
catch (Exception ex)
{
return ex;
}
}
Note: Make sure, fromEmail and (senderName, senderPass) should be same email with the credential.
Hope that would help.
Related
My client has an account in Office365 and he recently added this account in the website he is using. Now he says that he cannot send mails using this account, whilst other accounts are OK. He says that TLS is enabled in the account. Anyhow, I am able to login to the mail account. I checked the settings and found that the SMTP settings are as follows:
Server name: smtp.office365.com
Port: 587
Encryption method: STARTTLS
This is a sample code that I am using to check.
String userName = "365useraccount";
String password = "password";
MailMessage msg = new MailMessage();
msg.To.Add(new System.Net.Mail.MailAddress("test#test.com"));
msg.From = new System.Net.Mail.MailAddress(userName);
msg.Subject = "Test Office 365 Account";
msg.Body = "Testing email using Office 365 account.";
msg.IsBodyHtml = true;
System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
client.Host = "smtp.office365.com";
client.UseDefaultCredentials = false;
client.Credentials = new System.Net.NetworkCredential(userName, password);
client.Port = 587;
client.EnableSsl = true;
try
{
client.Send(msg);
}
catch
{
}
I am getting an exception with message:
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 [BMXPR01CA0043.INDPRD01.PROD.OUTLOOK.COM]
However, I am able to send mails using other Office365 accounts.
Any help of idea would be greatly appreciated
So im trying to send an email on C# and always getting the same error: "Additional information: The SMTP server requires a secure connection or the client was not authenticated." i have checked out pretty much every single link i could find about this i have diabled all gmail protection and my credentials are correct i don't know why this error continues
MailMessage mail = new MailMessage();
mail.From = new MailAddress("xx#gmail.com");
mail.Sender = new MailAddress("xx#gmail.com");
mail.To.Add("external#emailaddress");
mail.IsBodyHtml = true;
mail.Subject = "Email Sent";
mail.Body = "Body content from";
SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
smtp.UseDefaultCredentials = false;
smtp.Credentials = new System.Net.NetworkCredential("xx#gmail.com", "xx");
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.EnableSsl = true;
smtp.Timeout = 30000;
try
{
smtp.Send(mail);
}
catch (SmtpException ex)
{
MessageBox.Show(ex.Message.ToString());
}
This is the exception message from C#, what is the actual response from the server? You may need to enable "less secure apps" to connect to your gmail account first (see https://www.google.com/settings/security/lesssecureapps).
I have tried your code getting the error "5.5.1 Authentication required". Please give this link a try Sending email through Gmail SMTP server with C#
Hi guys I create a mail class to send emails.
public void SendEmail(string subject, string messageBody, string toAddress)
{
MailMessage mail = new MailMessage();
mail.To.Add(toAddress);
//mail.To.Add("amit_jain_online#yahoo.com");
mail.From = new MailAddress("noreply3ncra#gmail.com");
mail.Subject = subject;
string Body = messageBody;
mail.Body = Body;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient();
smtp.UseDefaultCredentials = false;
smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
smtp.Credentials = new System.Net.NetworkCredential
("noreply3ncra#gmail.com", "********");
//Or your Smtp Email ID and Password
smtp.EnableSsl = true;
smtp.Send(mail);
}
But I got this error:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.
So I have to sign into Gmail and enter the captcha code and after this every thing is going to be ok.
What should I do?
Try this:
You should enable application to access gmail account.
Try this link:
Gmail allow access
For more info refer this link:
Stackoverflow link
Add this also:
Add port no also to your code as:
smtp.Port = 587;
For more info refer this link:
Codeproject link
I am trying to send email in a .NET console application. I have an SMTP server with i.P. address X.X.X.X (sanitized to protect the innocent).
The SMTP server has been set up (the relay configured) to allow email from the server that is hosting the .NET console app, and send that email to the outside world.
I have tested this with telnet from the server hosting the console app. I successfully sent an email with telnet console from the server hosting the console app using the SMTP server's I.P. address. There is no authentication required when using telnet. I have not been given any connection credentials.
But when I try to do it in the .NET app, I get the following error:
Syntaz error, command unrecognized. The server response was: : Helo command rejected: need fully-qualified hostname
Here is my code:
string mailMessagetest = "test";
string subjecttest = "test";
List<string> recipienttest = new List<string>();
recipienttest.Add("me#mydomain.com");
utility.SendMail(recipienttest, subjecttest, mailMessagetest);
Here is the function SendMail:
public static void SendMail(List<string> recipient, string subject, string message)
{
MailMessage mailMessage = new MailMessage();
mailMessage.From = new MailAddress("myfriend#mydomain.com");
foreach (string to in recipient)
{
mailMessage.To.Add(to);
}
mailMessage.Subject = subject;
mailMessage.Body = message;
SmtpClient client = new SmtpClient();
client.Host = "X.X.X.X";
client.Port = 25;
client.Send(mailMessage);
}
Change the hostname from an IP address to its name, e.g. "smtp.provider.com" or if its internal "mailserver.domain".
UPDATE:
Try read this system.net.mail.smtpclient fqdn required and this the FQDN is not sent when you send a HELO or EHLO.
Create a user with password on your SMTP server then apply the following settings:
smtp.UseDefaultCredentials = false;
smtp.Credentials = new NetworkCredential("user", "pass");
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Port = 25;
smtp.EnableSsl = true; // or false depending your server
I am trying to create a web application which upon entering your email address and message , sends an email with this information from the email address.
I used this:
try
{
NetworkCredential login = new NetworkCredential("your_____#gmail.com", "password");
System.Net.Mail.MailMessage email = new System.Net.Mail.MailMessage();
email.To.Add(new MailAddress("my____email#gmail.com"));
email.From = new MailAddress("your_____#gmail.com");
email.Subject = "Question";
email.Body = question;
SmtpClient client = new SmtpClient("smtp.gmail.com");
client.EnableSsl = true;
client.UseDefaultCredentials = false;
client.Credentials = login;
client.Send(email);
}
catch
{
}
But its giving me an SMTP error.
"Service not available, closing
transmission channel. The server
response was: Cannot connect to SMTP
server 209.85.129.111
(209.85.129.111:25), connect error
10051" System.Exception
{System.Net.Mail.SmtpException}
To send through your gmail account, you need to connect to port 587:
SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
You do not need to specify port 587 - the code works without it. I have successfully sent and received e-mail using:
SmtpClient client = new SmtpClient("smtp.gmail.com");
If you look at the error closely, it says "Cannot connect to SMTP server" and error 10051 means the network is unreachable. Do you have a firewall blocking port 587?
Gmail uses port 465 and the erros show port 25
try using 465 port
http://mail.google.com/support/bin/answer.py?answer=76147