Gmail: Too many login attempts

Question

We have a .Net client to send emails through SMTP. We have our emails accounts over google apps technology (we use gmail with our domain). We have had problems with one emai

Answer 1

On the below page, make sure "Access for less secure apps" is set to Enabled. Sending SMTP through non-Google applications requires this.

https://www.google.com/settings/security

Also, make sure you have SSL enabled in your application.

Answer 2

We had this issue and found that this was due to changed user behaviour which resulted our noreply@******.com account reaching its daily limits. On this link you can review G Suite reports on emails, and also please find the sending limits for SMTP, and for SMTP relay.