Instapaper saves web pages to read later on your iPhone, iPad, Android, computer, or Kindle.
You can find more information here.
How this Instapaper + TrueMail integration works
1. Add new record to a Instapaper account
2. Zapier sends the email to be verified with TrueMail
3. Zapier updates the existing Instapaper record with TrueMail result code in a custom field
The test trigger.