sorrel.co, a real published series. Every name is invented.
Which send did it?
Google already published the answer. It just printed it as a string.
- 01
Google graded 26 send-days in this window and printed a string for each.
The strings are Klaviyo's own ids, the campaign id and the flow message id it puts in every email's Feedback-ID header. Postmaster prints them bare and stops.
- 02
Klaviyo ships no screen that turns a string back into a name.
The header exists so Gmail can report on the send. Nothing in Klaviyo reads the report back.
- 03
Joined, one flow carried 78.3% of the window.
Abandoned Cart, 21 of 26 days over the line, worst 1.74% on one day. The domain itself crossed 0.30% on 7 of 51 days and never rose above 0.61%.
Google names the send, never the person. A string we cannot match stays unmatched, and we say so.
Every sentence above, in Google and Klaviyo’s own words.4 sources, each dated
“Feedback-ID: a:b:c:SenderId”
“All emails sent from Klaviyo will automatically include a header called Feedback-ID.”
“For a given day's traffic, FBL reports are generated only if a given Identifier is present in a certain volume of mails as well as in distinct user spam reports.”
“The spam rate is the percent of your messages that are delivered to engaged recipient's Inbox and then marked as spam by the recipient.”