diff --git a/setup.cfg b/setup.cfg
index d5fd84a80b8..258081301c9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -103,6 +103,7 @@ report-timings =
     pandas==1.*
     matplotlib
 tests =
+    aiosmtpd
     async_generator
     bandit>=1.7.0
     coverage>=5.0.0,<7.3.1
diff --git a/tests/functional/lib/bash/test_header b/tests/functional/lib/bash/test_header
index 458a7dc908c..818c8522c5c 100644
--- a/tests/functional/lib/bash/test_header
+++ b/tests/functional/lib/bash/test_header
@@ -807,10 +807,13 @@ mock_smtpd_init() {  # Logic borrowed from Rose
         local SMTPD_LOG="${TEST_DIR}/smtpd.log"
         local SMTPD_HOST="localhost:${SMTPD_PORT}"
         # Set up fake SMTP server to catch outgoing mail & redirect to log:
-        python3 -u -m 'smtpd' -c 'DebuggingServer' -d -n "${SMTPD_HOST}" \
+        python3 -u -m 'aiosmtpd' \
+            --class aiosmtpd.handlers.Debugging stderr \
+            --debug --nosetuid \
+            --listen "${SMTPD_HOST}" \
             1>"${SMTPD_LOG}" 2>&1 &  # Runs in background
         local SMTPD_PID="$!"
-        while ! grep -q 'DebuggingServer started' "${SMTPD_LOG}" 2>'/dev/null'
+        while ! grep -q 'is listening' "${SMTPD_LOG}" 2>'/dev/null'
         do
             if ps "${SMTPD_PID}" 1>/dev/null 2>&1; then
                 sleep 1  # Still waiting for fake server to start