[alert] Please login via your web browser

Question

I get "[alert] Please login via your web browser" error.

using (Imap imap = new Imap())
{
     imap.ConnectSSL("imap.gmail.com");
     imap.UseBestLogin("junaid21700@gmail.com", "xxx");

     imap.SelectInbox();

     List<long> uids = imap.Search(Flag.Unseen);
     foreach (long uid in uids)
     {
        var eml = imap.GetMessageByUID(uid);
        IMail mail = new MailBuilder().CreateFromEml(eml);

        Console.WriteLine(mail.Subject);
        Console.WriteLine(mail.Text);
     }
     imap.Close();
 }

I'm begginer please help what is the problem

Answer 1

First log in to the specified account via the web browser, you might have received an email with the blocked attempt information. Review it - you might need to confirm it was you.

There are several ways of dealing with this error:

• Enable "Access for less secure apps" at: https://www.google.com/settings/security/lesssecureapps
  (use incognito mode so you are sure you are logged in to correct account)

Please note that contrary to what the label says those applications (such as Thunderbird, Outlook and Mail.dll) are secure – they use TLS or SSL to secure the communication. The label name Gmail uses is misleading and false.

• Use OAuth 2.0 (OAuth 2.0 for installed applications, OAuth 2.0 for web applications, OAuth 2.0 for service accounts)

• Use application specific passwords (You can find how to create one in the Gmail support site)

• In some cases you'll need to use unlock captcha (use incognito mode so you are sure you are logged in to correct account): https://accounts.google.com/DisplayUnlockCaptcha