Do you block any domains or email addresses?

Yes - for security there are some domains and email addresses that are blocked from sending email through our service.

  • We do not publish a list of these domains / email addresses.
  • The service is not compatible with sending from free / shared email services, you can only send from your own domain name or a domain name you have administrative access to.

If you get an error message saying 'Not allowed to send from this domain' when using our authenticated SMTP mail relay please contact us and we can investigate.