Chore: Switch to a local IMAP server instead of a real email service (#11913)

docker/compose/docker-compose.ci-test.yml

@@ -23,3 +23,14 @@ services:
     container_name: tika
     network_mode: host
     restart: unless-stopped
+  greenmail:
+    image: greenmail/standalone:2.1.8
+    hostname: greenmail
+    container_name: greenmail
+    environment:
+      # Enable only IMAP for now (SMTP available via 3025 if needed later)
+      GREENMAIL_OPTS: >-
+        -Dgreenmail.setup.test.imap -Dgreenmail.users=test@localhost:test -Dgreenmail.users.login=test@localhost -Dgreenmail.verbose
+    ports:
+      - "3143:3143" # IMAP
+    restart: unless-stopped