HTTP status Code: 400

Whatever you tried to do, this cannot be acomplished. There are many reasons:

  • You tried to add contact that is already on your blacklist
  • You tried to add contact, but his email address is invalid (domain don't exist or domain don't have this email registered)
  • You tried to add contact that was previously deleted or bouced
  • You tried to send draft but given message is not a draft
  • You tried to set not active from-field as a default one

We always add more information in the context or description section in the error response.