Just Go here : Less secure apps , Log on using your Email and Password which use for sending mail in your c# code , and choose Turn On. Also please go to this link and click on Continue Allow access to your Google account also I edit it little bit : public string sendit(string … Read more
This is actually per RFC 2821 (4.5.2 Transparency) Before sending a line of mail text, the SMTP client checks the first character of the line. If it is a period, one additional period is inserted at the beginning of the line. .Net is just storing the file in “ready to transmit” mode which means that … Read more
The SmtpClient can be used by code: SmtpClient mailer = new SmtpClient(); mailer.Host = “mail.youroutgoingsmtpserver.com”; mailer.Credentials = new System.Net.NetworkCredential(“yourusername”, “yourpassword”);
That error message is typically caused by one of the following: Incorrect connection settings, such as the wrong port specified for the secured or non-secured connection Incorrect credentials. I would verify the username and password combination, to make sure the credentials are correct.
The following code works for me. Your code was giving me errors, I believe it was due to not setting the port to 587. http://forums.asp.net/t/1250771.aspx/4/10 MailMessage mail = new MailMessage(); mail.To.Add(to); mail.From = new MailAddress(from); mail.Subject = subject; mail.Body = body; mail.IsBodyHtml = true; SmtpClient smtp = new SmtpClient(“smtp.gmail.com”,587); smtp.EnableSsl = true; smtp.UseDefaultCredentials = false; … Read more
Well, the “failure sending e-mail” should hopefully have a bit more detail. But there are a few things that could cause this. Restrictions on the “From” address. If you are using different from addresses, some could be blocked by your SMTP service from being able to send. Flood prevention on your SMTP service could be … Read more
Create a custom app in you Gmail security settings. Log-in into Gmail with your account Navigate to https://security.google.com/settings/security/apppasswords In ‘select app’ choose ‘custom’, give it an arbitrary name and press generate It will give you 16 chars token. Use the token as password in combination with your full Gmail account and two factor authentication will … Read more
to send over gmail, you need to use an encrypted connection. this is not possible with telnet alone, but you can use tools like openssl either connect using the starttls option in openssl to convert the plain connection to encrypted… openssl s_client -starttls smtp -connect smtp.gmail.com:587 -crlf -ign_eof or connect to a ssl sockect directly… … Read more
I know this is an old topic, BUT… Google has changed something on their security settings. Was struggling with all the answers until I checked my email with a mail from Google stating that “we’ve recently blocked a sign-in attempt on your Google account”. That led me to this page: Google Account Security Under the … Read more
There is no way. SmtpClient bascially can not validate the usernamepassword without contacting the serve it connects to. What you could do is do it outside SmtpClient, by opening a TCP connection to the server… but authentication CAN be complicated depending how the server is configured. May I ask WHY you need to know that … Read more