diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 2b81a60d..55595838 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -13,7 +13,7 @@ on:
       - '[1-9].[0-9].[0-9]'
       # pre-releases, e.g. 1.8-pre1
       - 1.8-pre[0-9]
-    # test branches, e.g. test-debian
+      # test branches, e.g. test-debian
       - test-*
 
 ###############################################
@@ -39,6 +39,21 @@ jobs:
         shell: bash
         run: |
           echo "BRANCH=${GITHUB_REF#refs/heads/}" >> $GITHUB_ENV
+        #For branch TESTING, we set the image tag to PR-xxxx
+      - name: Derive MAILU_VERSION for branch testing
+        if: ${{ env.BRANCH == 'testing' }}
+        shell: bash
+        env:
+          COMMIT_MESSAGE: ${{ github.event.head_commit.message }}
+        run: |
+          echo "MAILU_VERSION=pr-${COMMIT_MESSAGE//[!0-9]/}" >> $GITHUB_ENV
+      - name: Derive MAILU_VERSION for other branches than testing
+        if: ${{ env.BRANCH != 'testing' }}
+        shell: bash
+        env:
+          MAILU_BRANCH: ${{ env.BRANCH }}
+        run: |
+          echo "MAILU_VERSION=${{ env.MAILU_BRANCH }}" >> $GITHUB_ENV
       - name: Create folder for storing images
         run: |
           sudo mkdir -p /images
@@ -58,7 +73,7 @@ jobs:
         run: echo "$DOCKER_PW" | docker login --username $DOCKER_UN --password-stdin
       - name: Build all docker images
         env:
-          MAILU_VERSION: ${{ env.BRANCH }}
+          MAILU_VERSION: ${{ env.MAILU_VERSION }}
           TRAVIS_BRANCH: ${{ env.BRANCH }}
           DOCKER_ORG: ${{ secrets.DOCKER_ORG }}
         run: docker-compose -f tests/build.yml build
@@ -94,7 +109,7 @@ jobs:
       - name: Test core suite
         run: python tests/compose/test.py core 1
         env:
-          MAILU_VERSION: ${{ env.BRANCH }}
+          MAILU_VERSION: ${{ env.MAILU_VERSION }}
           TRAVIS_BRANCH: ${{ env.BRANCH }} 
           DOCKER_ORG: ${{ secrets.DOCKER_ORG }}
 
@@ -127,7 +142,7 @@ jobs:
       - name: Test fetch
         run: python tests/compose/test.py fetchmail 1
         env:
-          MAILU_VERSION: ${{ env.BRANCH }}
+          MAILU_VERSION: ${{ env.MAILU_VERSION }}
           TRAVIS_BRANCH: ${{ env.BRANCH }}
           DOCKER_ORG: ${{ secrets.DOCKER_ORG }}
 
@@ -160,7 +175,7 @@ jobs:
       - name: Test clamvav
         run: python tests/compose/test.py filters 2
         env:
-          MAILU_VERSION: ${{ env.BRANCH }}
+          MAILU_VERSION: ${{ env.MAILU_VERSION }}
           TRAVIS_BRANCH: ${{ env.BRANCH }}
           DOCKER_ORG: ${{ secrets.DOCKER_ORG }}
 
@@ -193,7 +208,7 @@ jobs:
       - name: Test rainloop
         run: python tests/compose/test.py rainloop 1
         env:
-          MAILU_VERSION: ${{ env.BRANCH }}
+          MAILU_VERSION: ${{ env.MAILU_VERSION }}
           TRAVIS_BRANCH: ${{ env.BRANCH }} 
           DOCKER_ORG: ${{ secrets.DOCKER_ORG }}
 
@@ -226,7 +241,7 @@ jobs:
       - name: Test roundcube
         run: python tests/compose/test.py roundcube 1
         env:
-          MAILU_VERSION: ${{ env.BRANCH }}
+          MAILU_VERSION: ${{ env.MAILU_VERSION }}
           TRAVIS_BRANCH: ${{ env.BRANCH }} 
           DOCKER_ORG: ${{ secrets.DOCKER_ORG }}
 
@@ -259,7 +274,7 @@ jobs:
       - name: Test webdav
         run: python tests/compose/test.py webdav 1
         env:
-          MAILU_VERSION: ${{ env.BRANCH }}
+          MAILU_VERSION: ${{ env.MAILU_VERSION }}
           TRAVIS_BRANCH: ${{ env.BRANCH }}
           DOCKER_ORG: ${{ secrets.DOCKER_ORG }}
 
@@ -280,6 +295,21 @@ jobs:
         shell: bash
         run: |
           echo "BRANCH=${GITHUB_REF#refs/heads/}" >> $GITHUB_ENV
+        #For branch TESTING, we set the image tag to PR-xxxx
+      - name: Derive MAILU_VERSION for branch testing
+        if: ${{ env.BRANCH == 'testing' }}
+        shell: bash
+        env:
+          COMMIT_MESSAGE: ${{ github.event.head_commit.message }}
+        run: |
+          echo "MAILU_VERSION=pr-${COMMIT_MESSAGE//[!0-9]/}" >> $GITHUB_ENV
+      - name: Derive MAILU_VERSION for other branches than testing
+        if: ${{ env.BRANCH != 'testing' }}
+        shell: bash
+        env:
+          MAILU_BRANCH: ${{ env.BRANCH }}
+        run: |
+          echo "MAILU_VERSION=${{ env.MAILU_BRANCH }}" >> $GITHUB_ENV
       - name: Create folder for storing images
         run: |
           sudo mkdir -p /images
@@ -300,9 +330,8 @@ jobs:
           DOCKER_PW: ${{ secrets.Docker_Password }}
           DOCKER_ORG: ${{ secrets.DOCKER_ORG }}
           DOCKER_ORG_TESTS: ${{ secrets.DOCKER_ORG_TESTS }}
-          MAILU_VERSION: ${{ env.BRANCH }}
+          MAILU_VERSION: ${{ env.MAILU_VERSION }}
           TRAVIS_BRANCH: ${{ env.BRANCH }}
-          TRAVIS_COMMIT_MESSAGE: ${{ github.event.head_commit.message }}
         run: bash tests/deploy.sh
 
  # This job is watched by bors. It only complets if building,testing and deploy worked.
diff --git a/tests/deploy.sh b/tests/deploy.sh
index a836417b..abb37b6b 100755
--- a/tests/deploy.sh
+++ b/tests/deploy.sh
@@ -3,14 +3,5 @@
 # Skip deploy for staging branch
 [ "$TRAVIS_BRANCH" = "staging" ] && exit 0
 
-# Retag in case of `bors try`
-if [ "$TRAVIS_BRANCH" = "testing" ]; then
-    export DOCKER_ORG=$DOCKER_ORG_TESTS
-    # Commit message is like "Try #99".
-    # This sets the version tag to "pr-99"
-    export MAILU_VERSION="pr-${TRAVIS_COMMIT_MESSAGE//[!0-9]/}"
-    docker-compose -f tests/build.yml build
-fi
-
 docker login -u $DOCKER_UN -p $DOCKER_PW
 docker-compose -f tests/build.yml push