Trying to send the message to my Gmail account.

Raja Priya Meganathan

I'm trying to send the message to my Gmail account through SMTP. And here is my code.

try
{
MailMessage msg = new MailMessage();
msg.From = new MailAddress("[email protected]");
msg.To.Add("[email protected]");
msg.Subject = "test";
msg.Body = "Test Content";
msg.Priority = MailPriority.High;
SmtpClient client = new SmtpClient();
client.UseDefaultCredentials = false;
client.Credentials = new NetworkCredential("[email protected]", "123", "smtp.gmail.com");
client.Host = "smtp.gmail.com";
client.Port = 587;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.EnableSsl = true;
client.Send(msg);
}
catch (Exception ex)
{
throw ex;
}

It's throwing the exception "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required"

6 Replies

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Tamil Rk5y ago
Accepted answer
Hello RAJAPRIYA MEGANATHAN,

Click the below links from your 'To' mail logged-in browser and enable the access,

https://myaccount.google.com/lesssecureapps?pli=1&rapt=AEjHL4MHHu9mhGhJLWz2ofCnI768J3iPofmXW3wgERXyOChvcWW3Lk1vA5KECfGlLCfNjM4Iudk64xFpx0Q5XrJaJe97z0n1wQ

https://accounts.google.com/DisplayUnlockCaptcha

Thanks
Ravi Patel5y ago
Hi Code looks fine

try this
Turn on the Access for less secure apps from your gmail setting
for more detail please check below link

https://stackoverflow.com/questions/20906077/gmail-error-the-smtp-server-requires-a-secure-connection-or-the-client-was-not/26709761#26709761
Sachin Singh5y ago
sometimes ordering too matters , notice i am setting credential at last , change accordingly and test.
Raja Priya Meganathan5y ago
I have set the correct From and To address and credentials on my code. In my above example code contains sample credentials. I have used my local account for this testing. And I also enable the less secure apps.
Salman Beg5y ago
Hey. Did you provided the right credentials? Follow this link to check your code, https://www.c-sharpcorner.com/article/sending-email-using-c-sharp/
Sachin Singh5y ago
From : should be your gmail account
To : can be any account
credential must be correct .
if the above conditions are correct then
you might be trying to login from a different time zone, use your local account for testing.
then follow this
System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient
{
    Host = Emailer.Host,
    Port = Emailer.Port,
    EnableSsl = Emailer.RequireSSL,
    UseDefaultCredentials = false,
    DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network,
    Credentials = new NetworkCredential("[email protected]", "123", "smtp.gmail.com");
}

client.Send(msg);