I've been struggeling a lot with this now.
I try to send mail with my mvc application using my google apps account. But I keep getting errors. It doesn't matter which settings I use. I tried using both port 465 and 587 with ssl and authentication turned on. With 465 I get Operation Timed Out and with 587 I get this message:
The SMTP server requires a secure connection or the client was not
authenticated. The server response was: 5.5.1 Authentication Required
I tried turning of the firewall with no luck. I have also tried to turn off 2-step authentication but I figured out that it wasn't even turned on.
I hope that you can help me
Regards
Here is the code as requested:
public static void SendMail(MailAddress from, MailAddress to, string subject, string body) {
MailMessage mail = new MailMessage();
mail.From = from;
mail.To.Add(to);
mail.Subject = subject;
mail.Body = body;
SmtpClient client;
if (Settings.Port != null)
client = new SmtpClient(Settings.Host, Int32.Parse(Settings.Port));
else
client = new SmtpClient(Settings.Host);
client.EnableSsl = Settings.UseSSL;
client.Timeout = 50000;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
if (Settings.UseAuthentication) {
client.Credentials = new NetworkCredential(Settings.Username, Settings.Password);
client.UseDefaultCredentials = false;
}
client.Send(mail);
}
I have checked all obvius stuff like username and password (username is formed like user#domain.com). I've also stepped through the code to verify my settings class is working as it should
I found out what the problem was. client.UseDefaultCredentials = false; must go before the credentials is set. Now client.Sendmethod returns without exceptions.
Related
I have recently moved the web app from one server to another. No changes in the code or web config (apart from database connection) has been done.
In the old server, the application could send emails. In the new server, this error arises. Is there a configuration that I am missing here? I looked in IIS Manager, and the SMTP Email is not even activated in the old server. It seems to be an authentication issue, I do not know how the authentication works in this case.
I have not done the configuration in the old server so I do not know where to look.
public MailHelper(string sender, string recipient)
{
NetworkCredential cred = new NetworkCredential(SmtpUser, SmtpPassword);
message = new MailMessage(sender, recipient);
client = new SmtpClient();
client.Port = 25;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.UseDefaultCredentials = true;
client.Host = SmtpHost;
}
public void Send(string subject, string body)
{
message.Subject = subject;
message.IsBodyHtml = true;
message.Body = body;
client.Send(message);
}
What are my next steps?
Cheers.
image of stacktrace: https://ibb.co/fd2jwPG
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.
I'm trying to send an email via .net smtp. I am receiving this message:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated
MailMessage mail = new MailMessage();
SmtpClient SmtpServer = new SmtpClient("server", 587);
SmtpServer.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
SmtpServer.UseDefaultCredentials = false;
SmtpServer.EnableSsl = false;
SmtpServer.Credentials = new System.Net.NetworkCredential("username", "password");
mail.From = new MailAddress(FromMail);
mail.To.Add("emailaddress");
mail.Bcc.Add("emailaddress");
mail.Subject = subject;
mail.Body = body;
mail.IsBodyHtml = true;
SmtpServer.Send(mail);
The issue I believe is that the servers are located in the DMZ...anyone have any insight on how to fix this? If we assign the user with domain admin rights, the emails work...due to security reasons we don't want to go that route.
Issue resolved...the network team didn't have port 587 available...once they added it, emails started working for anonymous sender. I no longer need to use credentials. Thanks to all who replied.
I see many posts on SMTPClient but I'm still stuck.
I am creating a C# Console application targeting the .NET 4.0 framework and running on a Windows 2008 R2 Datacenter (server).
I want send an email using SSL from a gmail account I just created.
If I use port 587, I get an exception:
The SMTP server requires a secure connection or the client was not authenticated
If I use port 465, I get another one:
Unable to read data from the transport connection: A blocking operation was interrupted by a call to WSACancelBlockingCall.
I realize this question has been asked several times in the past. All answers I see relate to the order in which UseDefaultCredentials is set. It must be set to false BEFORE the real credentials are set. I have followed this advice (as per the code below) and yet I still get a failure.
Other answers include switching ports from 465 to 587... which i have tried and just results in a different error (as stated above).
Here's my code:
NetworkCredential credentials = new NetworkCredential("something#gmail.com", "2-step-auth-Password");
MailAddress address = new MailAddress("something#gmail.com");
SmtpClient client = new SmtpClient("smtp.gmail.com", 465); // or 587
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.UseDefaultCredentials = false;
client.EnableSsl = true;
client.Credentials = credentials;
client.Timeout = 10000; // 10 seconds.
client.Host = "smtp.gmail.com";
//client.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);
MailMessage message = new MailMessage("example#gmail.com", recipients);
message.Subject = "Hello";
message.Body = "Goodbye";
message.BodyEncoding = Encoding.UTF8;
try
{
client.Send(message);
}
catch (Exception ex)
{
Console.WriteLine("Exception caught in CreateTestMessage2(): {0}", ex.ToString());
}
message.Dispose();
Update 2: I see another answer which may be my issue: gmail requires an application-specific password (which is apparently not available with my current gmail account. not sure why yet). but this may be my issue.
Update 3: I have followed all instructions. Generated 2-step authentication with Gmail, and still fails.
Below code works for me, you can try this:
SmtpClient smtp = new SmtpClient("smtp.office365.com");
//Your Port gets set to what you found in the "POP, IMAP, and SMTP access" section from Web Outlook
smtp.Port = 587;
//Set EnableSsl to true so you can connect via TLS
smtp.EnableSsl = true;
System.Net.NetworkCredential cred = new System.Net.NetworkCredential("Username", "Password");
smtp.Credentials = cred;
MailMessage mail = new MailMessage();
mail.From = new MailAddress("Sender Email Address", "Sender Name");
StringBuilder mailBody = new StringBuilder();
mail.To.Add("ToEmailAddress");
mail.Subject = "Subject";
mail.IsBodyHtml = true;
mail.Body = "Body Text";
try
{
smtp.Send(mail);
}
catch (Exception ex)
{
}
Can we use gmail account to send email in asp.net website from *localhost * (local machine) ? I am trying but badly unsuccessful. It works fine on hosting but donot work on my machine.
I have windows server 2003 on my machine, I have added port 587 and 465 in firewall in exceptions. In my gmail account I also have enabled POP and IMAP. Some people suggest to use port 465 and others say port 587 should be used. I tried both and below was my result:
Using port 465 it take time and finally give message that the opration has timed out. falure
Using port 587 it dont take time, show message "failuer sending email" with an inner expection "No connection could be made because the target machine actively refused it 72.14.213.109:587"
Below is my code, please guide me where I am wrong or what I should do.
thanks
public static bool SendMail(string gMailAccount, string password, string to, string subject, string message)
{
try
{
NetworkCredential loginInfo = new NetworkCredential(gMailAccount, password);
MailMessage msg = new MailMessage();
msg.From = new MailAddress(gMailAccount);
msg.To.Add(new MailAddress(to));
msg.Subject = subject;
msg.Body = message;
msg.IsBodyHtml = true;
SmtpClient client = new SmtpClient("smtp.gmail.com");
client.EnableSsl = true;
client.UseDefaultCredentials = false;
client.Credentials = loginInfo;
client.Port = 587;
client.Send(msg);
return true;
}
catch (Exception e)
{
return false;
}
}
I use smtp.yandex.com. May be need change settings in your gmail account.
Try this firs: add:
client.DeliveryMethod = SmtpDeliveryMethod.Network;
If that does not help, your mailaddress might not be complete, use
var fromAddress = new MailAddress("from#gmail.com", "From Name");
and in the credentials use
Credentials = new NetworkCredential(fromAddress.Address, ....
Hope that helps
This SmtpClient has always worked for me:
new SmtpClient
{
Host = "smtp.gmail.com",
Port = 587,
EnableSsl = true,
UseDefaultCredentials = false,
Credentials = new NetworkCredential("noreply#my_domain.com", "password")
};
And it matches yours.
Have you been able to contact smtp.gmail.com on port 587 through any other app? Telnet on that port maybe? Am thinking it's probably a network issue, although you did state that your firewall was wide open it's not the only hop between you and google.