diff --git a/src/caosadvancedtools/serverside/helper.py b/src/caosadvancedtools/serverside/helper.py
index 7a22891aecf5eed803a8566a2a483b4c584bbd0c..466698ac414c43ac07728288e979374f1706c680 100644
--- a/src/caosadvancedtools/serverside/helper.py
+++ b/src/caosadvancedtools/serverside/helper.py
@@ -25,8 +25,8 @@ import datetime
 import json
 import logging
 import os
-import sys
 import subprocess
+import sys
 from email import message, policy, utils
 
 import caosdb as db
@@ -351,9 +351,14 @@ def send_mail(from_addr, to, subject, body, cc=None, bcc=None):
 
     if cc is not None:
         mail["CC"] = cc if isinstance(cc, str) else ", ".join(cc)
+
     if bcc is not None:
         mail["BCC"] = bcc if isinstance(cc, str) else ", ".join(cc)
 
-    p = subprocess.Popen([sendmail, "-t", "-oi"],
-                         stdin=subprocess.PIPE)
+    with open("/tmp/debugmail.txt") as fi:
+        fi.write(" ".join([sendmail, "-t", "-oi"]))
+    with open("/tmp/debugmsg.txt") as fi:
+        fi.write(mail)
+
+    p = subprocess.Popen([sendmail, "-t", "-oi"], stdin=subprocess.PIPE)
     p.communicate(mail.as_bytes())