diff --git a/tests/instrumentation/docker-compose.yml b/tests/instrumentation/docker-compose.yml
index 6a112bb..21b5d7c 100644
--- a/tests/instrumentation/docker-compose.yml
+++ b/tests/instrumentation/docker-compose.yml
@@ -20,3 +20,10 @@ services:
       - "/dev/log:/dev/log"
     ports:
       - "143:143/tcp"
+
+  courier:
+    build:
+      context: ./docker/courier/
+    image: courier
+    ports:
+      - "144:143/tcp"
diff --git a/tests/instrumentation/docker/courier/Dockerfile b/tests/instrumentation/docker/courier/Dockerfile
new file mode 100644
index 0000000..08230e7
--- /dev/null
+++ b/tests/instrumentation/docker/courier/Dockerfile
@@ -0,0 +1,10 @@
+FROM debian:sid
+
+RUN apt-get update
+RUN apt-get install -y courier-imap
+RUN useradd -m debian -p '$1$B8Mq5Hki$fg5f4SndVNWsfq.mJiqbI0'
+USER debian
+RUN maildirmake /home/debian/Maildir
+USER root
+COPY ./entrypoint.sh /entrypoint
+ENTRYPOINT ["/entrypoint"]
diff --git a/tests/instrumentation/docker/courier/entrypoint.sh b/tests/instrumentation/docker/courier/entrypoint.sh
new file mode 100755
index 0000000..e95973a
--- /dev/null
+++ b/tests/instrumentation/docker/courier/entrypoint.sh
@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+
+/usr/lib/courier/courier-authlib/authdaemond &
+/usr/sbin/couriertcpd -address=0 -maxprocs=40 -maxperip=20 -access=/etc/courier/imapaccess.dat -nodnslookup -noidentlookup 143 /usr/lib/courier/courier/imaplogin /usr/bin/imapd Maildir
diff --git a/tests/instrumentation/send-to-imap.py b/tests/instrumentation/send-to-imap.py
index df49076..1f8edae 100644
--- a/tests/instrumentation/send-to-imap.py
+++ b/tests/instrumentation/send-to-imap.py
@@ -51,6 +51,14 @@ parameters = {
     "ext": ".cyrus",
     "mb": "INBOX."+base_test_mb,
   },
+  "courier": {
+    "con": IMAP4,
+    "port": 144,
+    "user": "debian",
+    "pw": "debian",
+    "ext": ".courier",
+    "mb": base_test_mb,
+  },
   "stalwart": {
     "con": IMAP4_SSL,
     "port": 1993,