diff --git a/plan.txt b/plan.txt
index 2de87e59..44e56375 100644
--- a/plan.txt
+++ b/plan.txt
@@ -26,10 +26,6 @@
 
 ## doveauth questions/futures
 
-- measurement:
-  What happens if you do 100 logins in parallel?
-  What fraction is taken by TLS, what by dovecot-auth?
-
 - bcrypt-password scheme is slow: require long passwords, use faster hashing
 
 - define user-name and password policies, and implement them
diff --git a/scripts/measure_tls_and_logins.py b/scripts/measure_tls_and_logins.py
index 79dd494a..16bd7bdf 100644
--- a/scripts/measure_tls_and_logins.py
+++ b/scripts/measure_tls_and_logins.py
@@ -1,16 +1,17 @@
-
+import os
 import time
-
 import imaplib
 
+domain = os.environ.get("CHATMAIL_DOMAIN", "c3.testrun.org")
+
 NUM_CONNECTIONS=10
 
 conns = []
 
 start = time.time()
 for i in range(NUM_CONNECTIONS):
-    print(f"opening connection {i}")
-    conn = imaplib.IMAP4_SSL("c3.testrun.org")
+    print(f"opening connection {i} to {domain}")
+    conn = imaplib.IMAP4_SSL(domain)
     conns.append(conn)
 
 tlsdone = time.time()