Sending an account invitation on Red Hat 3scale API Management spams the SMTP server

Solution Verified - Updated -


  • When sending an account invitation in Red Hat 3scale API Management with an address e.g. and the SMTP server does not allow to send to the provided domain e.g., the 3scale API Management sidekiq service receives the following error:

    SendUserInvitationWorker#perform raised Net::SMTPFatalError with message 550 You are not allowed to send messages to recipients outside of our organization.
  • Invitations can either be send

    • via the Admin Portal to invite a user to an account as shown in the image
      Account invitation
    • or via the Developer Portal
  • Red Hat 3scale API management will retry to send this user's invitation mail multiple times per second for an infinit duration.
  • This behavior may trigger DDoS and spam detection mechanisms which will block the RHOCP worker node.


  • Red Hat 3scale API Management 2.11.0 On-Premise
  • Red Hat OpenShift Container Platform (RHOCP) 4.x

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