I host my rails application on Heroku and send mail with SendGrid add-on with starter plan, and it works well till 18 May.
But, these months, all mail (includes several to) blocked with message "Reached max queue time". Anyone know what happened and how to solve.
I cannnot find information in heroku's devcenter and google. https://devcenter.heroku.com/articles/support-channels
thanks