diff --git a/.drone-manifest.yml b/.drone-manifest.yml
deleted file mode 100644
index 6dbfc2a..0000000
--- a/.drone-manifest.yml
+++ /dev/null
@@ -1,22 +0,0 @@
-image: happydomain/checker-happydeliver:{{#if build.tag}}{{trimPrefix "v" build.tag}}{{else}}latest{{/if}}
-{{#if build.tags}}
-tags:
-{{#each build.tags}}
-  - {{this}}
-{{/each}}
-{{/if}}
-manifests:
-  - image: happydomain/checker-happydeliver:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-amd64
-    platform:
-      architecture: amd64
-      os: linux
-  - image: happydomain/checker-happydeliver:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm64
-    platform:
-      architecture: arm64
-      os: linux
-      variant: v8
-  - image: happydomain/checker-happydeliver:{{#if build.tag}}{{trimPrefix "v" build.tag}}-{{/if}}linux-arm
-    platform:
-      architecture: arm
-      os: linux
-      variant: v7
diff --git a/.drone.yml b/.drone.yml
deleted file mode 100644
index 818135f..0000000
--- a/.drone.yml
+++ /dev/null
@@ -1,187 +0,0 @@
----
-kind: pipeline
-type: docker
-name: build-amd64
-
-platform:
-  os: linux
-  arch: amd64
-
-steps:
-  - name: checker build
-    image: golang:1-alpine
-    commands:
-      - apk add --no-cache git make
-      - make
-    environment:
-      CHECKER_VERSION: "${DRONE_BRANCH}-${DRONE_COMMIT}"
-      CGO_ENABLED: 0
-    when:
-      event:
-        exclude:
-          - tag
-
-  - name: checker build tag
-    image: golang:1-alpine
-    commands:
-      - apk add --no-cache git make
-      - make
-    environment:
-      CHECKER_VERSION: "${DRONE_SEMVER}"
-      CGO_ENABLED: 0
-    when:
-      event:
-        - tag
-
-  - name: publish on Docker Hub
-    image: plugins/docker
-    settings:
-      repo: happydomain/checker-happydeliver
-      auto_tag: true
-      auto_tag_suffix: ${DRONE_STAGE_OS}-${DRONE_STAGE_ARCH}
-      dockerfile: Dockerfile
-      build_args:
-        - CHECKER_VERSION=${DRONE_BRANCH}-${DRONE_COMMIT}
-      username:
-        from_secret: docker_username
-      password:
-        from_secret: docker_password
-    when:
-      event:
-        exclude:
-          - tag
-
-  - name: publish on Docker Hub (tag)
-    image: plugins/docker
-    settings:
-      repo: happydomain/checker-happydeliver
-      auto_tag: true
-      auto_tag_suffix: ${DRONE_STAGE_OS}-${DRONE_STAGE_ARCH}
-      dockerfile: Dockerfile
-      build_args:
-        - CHECKER_VERSION=${DRONE_SEMVER}
-      username:
-        from_secret: docker_username
-      password:
-        from_secret: docker_password
-    when:
-      event:
-        - tag
-
-trigger:
-  branch:
-    exclude:
-      - renovate/*
-  event:
-    - cron
-    - push
-    - tag
-
----
-kind: pipeline
-type: docker
-name: build-arm64
-
-platform:
-  os: linux
-  arch: arm64
-
-steps:
-  - name: checker build
-    image: golang:1-alpine
-    commands:
-      - apk add --no-cache git make
-      - make
-    environment:
-      CHECKER_VERSION: "${DRONE_BRANCH}-${DRONE_COMMIT}"
-      CGO_ENABLED: 0
-    when:
-      event:
-        exclude:
-          - tag
-
-  - name: checker build tag
-    image: golang:1-alpine
-    commands:
-      - apk add --no-cache git make
-      - make
-    environment:
-      CHECKER_VERSION: "${DRONE_SEMVER}"
-      CGO_ENABLED: 0
-    when:
-      event:
-        - tag
-
-  - name: publish on Docker Hub
-    image: plugins/docker
-    settings:
-      repo: happydomain/checker-happydeliver
-      auto_tag: true
-      auto_tag_suffix: ${DRONE_STAGE_OS}-${DRONE_STAGE_ARCH}
-      dockerfile: Dockerfile
-      build_args:
-        - CHECKER_VERSION=${DRONE_BRANCH}-${DRONE_COMMIT}
-      username:
-        from_secret: docker_username
-      password:
-        from_secret: docker_password
-    when:
-      event:
-        exclude:
-          - tag
-
-  - name: publish on Docker Hub (tag)
-    image: plugins/docker
-    settings:
-      repo: happydomain/checker-happydeliver
-      auto_tag: true
-      auto_tag_suffix: ${DRONE_STAGE_OS}-${DRONE_STAGE_ARCH}
-      dockerfile: Dockerfile
-      build_args:
-        - CHECKER_VERSION=${DRONE_SEMVER}
-      username:
-        from_secret: docker_username
-      password:
-        from_secret: docker_password
-    when:
-      event:
-        - tag
-
-trigger:
-  event:
-    - cron
-    - push
-    - tag
-
----
-kind: pipeline
-name: docker-manifest
-
-platform:
-  os: linux
-  arch: arm64
-
-steps:
-  - name: publish on Docker Hub
-    image: plugins/manifest
-    settings:
-      auto_tag: true
-      ignore_missing: true
-      spec: .drone-manifest.yml
-      username:
-        from_secret: docker_username
-      password:
-        from_secret: docker_password
-
-trigger:
-  branch:
-    exclude:
-      - renovate/*
-  event:
-    - cron
-    - push
-    - tag
-
-depends_on:
-  - build-amd64
-  - build-arm64
diff --git a/README.md b/README.md
index caceaf9..637de63 100644
--- a/README.md
+++ b/README.md
@@ -49,19 +49,6 @@ Defaults: `overall=70`, `dns=70`, `authentication=80`, `spam=70`,
 `blacklist=90`, `header=70`, `content=60`. Each can be customised through
 the rule options shown in the happyDomain UI.
 
-## Rules
-
-| Code                                  | Description                                                                                       | Severity |
-|---------------------------------------|---------------------------------------------------------------------------------------------------|----------|
-| `happydeliver.score.overall`          | Verifies happyDeliver's Overall score is above the configured minimum.                            | CRITICAL |
-| `happydeliver.score.dns`              | Verifies happyDeliver's DNS score is above the configured minimum.                                | CRITICAL |
-| `happydeliver.score.authentication`   | Verifies happyDeliver's Authentication (SPF/DKIM/DMARC) score is above the configured minimum.    | CRITICAL |
-| `happydeliver.score.spam`             | Verifies happyDeliver's Spam filters score is above the configured minimum.                       | CRITICAL |
-| `happydeliver.score.blacklist`        | Verifies happyDeliver's Blacklists score is above the configured minimum.                         | CRITICAL |
-| `happydeliver.score.header`           | Verifies happyDeliver's Headers score is above the configured minimum.                            | CRITICAL |
-| `happydeliver.score.content`          | Verifies happyDeliver's Content score is above the configured minimum.                            | CRITICAL |
-| `happydeliver.lifecycle`              | Reports happyDeliver lifecycle errors (allocation, send, timeout, fetch).                         | CRITICAL |
-
 ## Metrics
 
 One `happydeliver_score` metric per section, labelled with `section=<name>`
diff --git a/checker/definition.go b/checker/definition.go
index 50d9612..ecdef33 100644
--- a/checker/definition.go
+++ b/checker/definition.go
@@ -14,7 +14,9 @@ func Definition() *sdk.CheckerDefinition {
 		Name:    "Outbound deliverability (via happyDeliver)",
 		Version: Version,
 		Availability: sdk.CheckerAvailability{
-			ApplyToService: true,
+			ApplyToDomain:   true,
+			ApplyToService:  true,
+			LimitToServices: []string{"svcs.MXs"},
 		},
 		ObservationKeys: []sdk.ObservationKey{ObservationKeyHappyDeliver},
 		Options: sdk.CheckerOptionsDocumentation{