diff --git a/backlog/config.yml b/backlog/config.yml
index 40a40f4..56b6072 100644
--- a/backlog/config.yml
+++ b/backlog/config.yml
@@ -13,3 +13,4 @@ auto_commit: false
 bypass_git_hooks: false
 check_active_branches: true
 active_branch_days: 30
+task_prefix: "task"
diff --git a/backlog/tasks/task-3 - Switch-DNS-to-community.cadcad.org.md b/backlog/tasks/task-3 - Switch-DNS-to-community.cadcad.org.md
index 84ea7c1..0b18580 100644
--- a/backlog/tasks/task-3 - Switch-DNS-to-community.cadcad.org.md	
+++ b/backlog/tasks/task-3 - Switch-DNS-to-community.cadcad.org.md	
@@ -1,7 +1,7 @@
 ---
 id: task-3
 title: Switch DNS to community.cadcad.org
-status: To Do
+status: Done
 assignee: []
 created_date: '2026-02-10 02:22'
 labels: []
@@ -14,3 +14,10 @@ priority: medium
 <!-- SECTION:DESCRIPTION:BEGIN -->
 Update DISCOURSE_HOSTNAME and Traefik Host rule in app.yml, rebuild, add community.cadcad.org to Cloudflare tunnel, coordinate CNAME record with cadcad.org DNS admin.
 <!-- SECTION:DESCRIPTION:END -->
+
+## Notes
+- DISCOURSE_HOSTNAME and Traefik Host rule were already set to `community.cadcad.org` in app.yml
+- cadcad.org zone added to Cloudflare account (2026-02-20), CNAME records created for @, www, and community
+- community.cadcad.org, cadcad.org, www.cadcad.org added to tunnel config and cloudflared restarted
+- Verified: community.cadcad.org serves Discourse forum, cadcad.org serves main Next.js site
+- Legacy cadcad-forum.jeffemmett.com still in tunnel config (can remove later)
diff --git a/backlog/tasks/task-4 - Configure-email-sending-domain.md b/backlog/tasks/task-4 - Configure-email-sending-domain.md
index f6dc5e3..f014047 100644
--- a/backlog/tasks/task-4 - Configure-email-sending-domain.md	
+++ b/backlog/tasks/task-4 - Configure-email-sending-domain.md	
@@ -1,9 +1,10 @@
 ---
-id: task-4
+id: TASK-4
 title: Configure email sending domain
-status: To Do
+status: Done
 assignee: []
 created_date: '2026-02-10 02:22'
+updated_date: '2026-02-22 01:25'
 labels: []
 dependencies: []
 priority: low
@@ -14,3 +15,17 @@ priority: low
 <!-- SECTION:DESCRIPTION:BEGIN -->
 Currently sending from noreply@jeffemmett.com. May want to switch to noreply@cadcad.org once domain is confirmed. Would need to add cadcad.org domain to mailcow or use authenticated SMTP.
 <!-- SECTION:DESCRIPTION:END -->
+
+## Notes
+- Added cadcad.org domain to Mailcow with DKIM key generated (2026-02-22)
+- Created noreply@cadcad.org mailbox
+- Added DNS records to Cloudflare: SPF (ip4:159.195.32.209), DKIM (2048-bit RSA), DMARC (quarantine), MX (mx.jeffemmett.com)
+- Updated Discourse app.yml: DISCOURSE_SMTP_DOMAIN=cadcad.org, DISCOURSE_NOTIFICATION_EMAIL=noreply@cadcad.org
+- Rebuilt Discourse container, reconnected to traefik-public and mailcow-network
+- Test email sent successfully: noreply@cadcad.org → jeffemmett@gmail.com (delivered via Gmail SMTP, status=sent)
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+cadcad.org domain already in Mailcow with noreply@cadcad.org mailbox. DNS records (MX, SPF, DKIM, DMARC) all configured in Cloudflare. Discourse SMTP already pointing to noreply@cadcad.org. Sender ACL updated.
+<!-- SECTION:NOTES:END -->