.net core unable to send email from g suite account

Question

this is the way i'm sending the email

try
            {
                using (MailMessage mail = new MailMessage())
                {
                    mail.From = new MailAddress("[email protected]");
                    mail.To.Add("[email protected]");
                    mail.Subject = "Hello World";
                    mail.Body = "<h1>Hello</h1>";
                    mail.IsBodyHtml = true;
                    using (System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.gmail.com", 587))
                    {
                        smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "password");
                        smtp.EnableSsl = true;
                        smtp.UseDefaultCredentials = false;
                        smtp.Send(mail);
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }

I did already activate the less secure app in account security setting.

This is the exception error :

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required

[Perhaps this answer](https://stackoverflow.com/a/63894228/3181933) (which seems to cover accounts belonging to the domain, rather than just the specific account which you seem to have already done)? — ProgrammingLlama, Oct 14 '20 at 08:16
im supposed to send email from `[email protected]` to `[email protected]` — Thameur Saadi, Oct 14 '20 at 08:25
I'll rephrase. In your question you stated: _"I did already activate the less secure app in account security setting."_. This suggests you made the change for `[email protected]`. The answer I linked to suggests there is another similar setting for `*@domain.com`. As per that answer, please go to https://admin.google.com/ac/security/lsa and see if it is allowed here. — ProgrammingLlama, Oct 14 '20 at 08:34
"I did already activate the less secure app" That error usually persists when gmail detects unsecure passwords. Consider changing the password and using a more robust/complex one — Cleptus, Oct 14 '20 at 08:54
Why not use a service account and go though gmail api why are you using smtp? — Linda Lawton - DaImTo, Oct 14 '20 at 12:46
Are you sending through Gmail? I can see that you are trying to send to a standard Gmail address but from what it looks like, you're also sending through Gmail? If not, why aren't you using their API? — jdewerth, Oct 14 '20 at 20:44

.net core unable to send email from g suite account

0 Answers0