Wow after facing this issue for about 1 month lucky for me it was a side project but this problem comes from the email plugins in /plugins. I couldn’t send emails to Gmail only but other random emails worked. I am disappointed I did not get a solution sooner online. If you work in a big company use email providers like SendGrid etc else if you are doing a small hobby project you can use google using SMTP. I used this library https://github.com/bass3l/strapi-provider-email-smtp and it worked immediately after over a month. Hope this helps someone out there