SMTP Error 5.5.1, username, password correct, ssl enabled. with gmail

Question

2.00/5 (1 vote)

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C#

MailMessage msg = new MailMessage();
SmtpClient client = new SmtpClient("smtp.gmail.com",587);
client.EnableSsl = true;        
client.UseDefaultCredentials = false;
client.Credentials = new NetworkCredential("myid@gmail.com","mypassword");
client.DeliveryMethod = SmtpDeliveryMethod.Network;    
msg.To.Add(new MailAddress("toid@yahoo.co.in"));
msg.From = new MailAddress("myid@gmail.com");
msg.Subject = "Test Mail";
msg.Body = "Body Of the E-mail";
try
{
    client.Send(msg);
    MessageBox.Show("Sent");
}
catch (Exception ex)
{
    MessageBox.Show("Error: " + ex);
    this.Dispose();
}

this is my code. can someone tell me what is wrong with this. i am getting error 5.5.1 AUTHENTICATION REQUIRED.
Further Details of error-The SMTP server requires a secure connection or the client was not authenticated.

i entered the correct username and password while testing but it's not working.
plz don't give links to other similar pages, i have already spent 6 hrs looking at them.
thanks in advance

Posted 31-Jan-12 8:53am

suvam8694

Updated 2-Mar-17 19:57pm

Chris Maunder772.9K

v2

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Comments

Sergey Alexandrovich Kryukov 31-Jan-12 15:09pm

Hard to say, it looks fine... only, 1) are you sure the server uses SSL? 2) did you try to do the same using some available e-mail sending software and exact same authentication options? Did it work?

--SA

2 solutions

Solution 3

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 )

Posted 2-Mar-17 19:57pm

sudeep.a

Comments

Graeme_Grant 3-Mar-17 2:04am

Any reason why you are replying to a 5 year old question?

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SvenMe · Accepted Answer · 2012-01-31T12:39:00

Your code is absolutely correct.
I tried your code with two different gmail accounts.
With the first account the message was sent. By using the second one I could reproduce your exception.
The difference with these two accounts is that the first one is using the plain authentication while the second one is using Google's two-way authentication.
I'm pretty sure the last scenario applies here ;)

Kindly try to add a new application specific password (in your gmail account settings) and use this one instead of your regular account password within your application.