I accidentally clicked the Stop these emails link in my sent email.
To comply with CAN-SPAM laws, Zapier must immediately turn your Zap off when the Stop these emails link is clicked. Once you turn your Zap back on, you'll be able to send emails again.
To prevent the Zapier Send email action from being used for spam, Zapier throttles the Send email action. If you’re on a trial or Free plan, the limit is 5 emails per Zapier account per hour. If you’re on a paid plan, the limit is 10 emails per Zapier account per hour. If your needs exceed this, you'll need to use a dedicated email sending provider like Gmail, Mandrill, Mailgun, or Sendgrid.
If you have a fixed file you want to attach to your email each time it sends in the Send email action, you first need to upload the file publicly (e.g., on Dropbox), then include the file URL in the Attachment field.