List sat silent; want to re-engage safely. · ⏱ ≈ 15 min + validation wait
Rescue a cold list before re-engagement
A list has been dormant for 6–12 months. You want to win those subscribers back — but if you mail to stale addresses, the bounce wave will crater your sender score and drag your active audience down with it.
The statuses used below are explained in What each Securify status means.
Email addresses decay ~23% per year — people change jobs, close ISP accounts, abandon providers. A list that was 96% deliverable last spring is maybe 75% deliverable today. Re-engagement without a fresh validation is the number-one cause of sender-reputation collapse we see.
Isolate the cold cohort
Left sidebar → Audience → Lists & segments → click Create segment (top-right). In the Segment builder, pick What someone has done (or not done) →Received Emailzero times in the last 180 days (or whatever window matches your definition of "cold").Run Securify on that segment
A list that sat silent for months needs today's verdict, not last spring's. Use Check and tag: the next step's audience is built on the tags.Send the re-engagement ONLY to the clean survivors
New campaign → audience = cold segment ANDsecurify_status equals deliverable. Once that wave lands cleanly, follow up with theunverifiableandcatch_allprofiles; the rest are dead or throwaway and stay parked.Decide what to do with the undeliverables
Two valid options: suppress them from all future sends (safer for reputation), or delete them from Klaviyo to reduce your profile count (cheaper if you pay per-profile). Klaviyo's profile delete is permanent — we recommend a standing suppression segment first.
Ready?
Open your dashboard and check the list you had in mind.