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Table of Contents:

Table of Contents

Email Message ID

  • Email messages are the contents (typically HTML email messages) you send to the contacts in your list. 
  • Every email message has a unique ID that you can find in the ID column on the Content → Email Messages page of the list.
  • It's helpful to use this unique ID when communicating with support.


  • ECID (short for ESP Connection ID): is the unique number ID given to each ESP connection in your Vendor Settings → My Connections dashboard
  • It's helpful to use this unique ID when communicating with support. 
  • You'll also need this ECID if you're doing a Transactional mailing via the API.
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  • The ESP ID (esp_id) is an internal unique Ongage ID that Ongage has assigned to each SMTP / ESP / SMS vendor.
  • You can find ESP ID by going to Vendors Settings → ESP/SMTP Vendors, and clicking on the name of anyone of the vendors there, e.g.,

  • Typically the ESP ID has no usage (except maybe in some unique API use-case), and is just an internal ID Ongage uses to uniquely identify different vendors.
    • It does appear in the Contact Activity Report (see Analytics), though in the future it will be replaced with the name of the vendor instead of the ID.