Build a re-engagement list from Constant Contact non-openers

1. Go to Channels > Emails, set Status to Sent, click the three dots on an email and choose Reporting.
2. Click the linked Did not open number to see the contacts who were sent the email and did not open it.
3. Repeat for each recent email, because the report covers one email at a time, and note who shows up in all of them.
4. In Contacts, select those people and use the Actions menu to add them to a list made for this send.
5. To target by activity without lists, Contacts > Segments can filter on email activity, but a segment is evaluated again at send time, so the group can change before your email goes out.

Find contacts who did not open any of my last 3 sent emails, put them in a new list called Re-engage Oct 2026 and tell me how many there are.

1. 01

   Pick the emails

   list_emails with status sent gives the sends; the agent takes the last 3, or the ones inside the window you named.

2. 02

   Collect non-openers per email

   list_email_contacts with type did_not_open returns one page per call; the agent follows the cursor to the end for each email and keeps only contact IDs that appear in every one.

3. 03

   Drop who should not get a send

   get_contact checks each candidate. Anyone whose permission_to_send is unsubscribed, or who already sits in the target list, is skipped, so you never mail someone who opted out.

4. 04

   Make or reuse the list

   list_lists shows whether Re-engage Oct 2026 exists. If not, create_list makes it, because a list needs a unique name; if it exists, the agent reuses it and does not create a second.

5. 05

   Add in batches

   add_contacts_to_list takes up to 500 contact IDs per call, so 1,300 contacts go in three calls. Each call waits for your OK by default, because adding contacts can move your account into a higher contact tier and puts them on any email scheduled to that list.

Sent emails checked: 3 (October newsletter, Webinar invite, Flash sale)
Did not open all 3: 212 contacts
Skipped 9 (unsubscribed) and 4 (already in the list)
Added 199 to Re-engage Oct 2026

curl -X POST https://cotlet.dev/api/v1/constant-contact/lists/9d2e4b7a-1c3f-4a58-b6e0-7f8a2c5d1e90/contacts-to-lists \
  -H "Authorization: Bearer $COTLET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"contact_ids":["c1a2b3d4-0001-4e5f-8a9b-1c2d3e4f5a01","c1a2b3d4-0002-4e5f-8a9b-1c2d3e4f5a02","c1a2b3d4-0003-4e5f-8a9b-1c2d3e4f5a03"]}'

{
  "list_id": "9d2e4b7a-1c3f-4a58-b6e0-7f8a2c5d1e90",
  "requested": 3,
  "added": 3
}

MCP: add https://cotlet.dev/mcp/v1 with the same key; the call is constant_contact_write → add_contacts_to_list. Example data.

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