By implementing a matching ID (in the form of either an X-header or a body tag) in your email campaigns, you can assist Everest in uniquely identifying your campaigns.
Your email service provider (ESP) may already include an X-header you can use as a matching ID. When you send your first inbox test to the Everest Seed List, your test result will show you whether your ESP has the appropriate X-header. (See Where do I find my Matching ID in Everest?) If there is a value under the X-250ok-CID column, you're ready to go and don't need to do anything further.
If no value is listed under X-250ok-CID, we recommend you include an additional X-header named X-250ok-CID with a unique value for each campaign. You will need to work with your ESP to include this header. Examples are listed below.
If your ESP doesn't have the ability to inject a header into outgoing email, we offer the ability to embed a tag in the HTML body of your email. Simply include, anywhere in the body, a tag that looks like this:
<!-- X-250ok-CID: uniqueid1234567890 -->
Again, make sure your ID is unique for each campaign.
Creating the matching header or body tag
Some best practices for creating a unique value for your header or body tag include:
- X-header or body tag names and values are case-sensitive.
- Do not include any spaces in the value.
- Prefix your campaign value with a company name or nickname.
- Consider including a timestamp in your value to help ensure uniqueness. For example: acme_202010221045 or acme_2020-10-22-1045
Everest will look for the following matching ID types by default:
Everest can also accept the following X-header types with a Validity Support request:
Inbox Placement includes a few configurable settings for matching ID. To change these settings, select Customize from the Overview tab. This will open the Inbox Settings slideout.
- On the Display Preferences tab, under Inbox Tests: Default Columns, check the box beside X-Header to display the matching ID in the Inbox Tests table. Select Save.
- On the Header Matching tab, toggle on the Copy to new child accounts switch to have child accounts inherit the matching header or body tag from the parent account.
- To hide the matching header or body tag from child accounts, toggle on Hide from child accounts.