Problem in sending e-mails from a Private Space app through SMTP

Issue

My Private Space app sends e-mails to an external SMTP server at port 25. It seems that the app is intermittently having a difficulty in sending e-mails.

Resolution

Our infrastructure provider applies a throttle on egress network connections to port 25 by default on Private Spaces. To work around this, please:

  • Use an alternative port to send e-mails, or
  • Contact Heroku Support with the name of the Private Space or the app to have the throttle removed for the Private Space

This throttle doesn't apply Common Runtime apps.

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