diff --git a/docker/utils/rootfs/opt/app-root/src/sendmail.py b/docker/utils/rootfs/opt/app-root/src/sendmail.py
new file mode 100755
index 00000000..e425f653
--- /dev/null
+++ b/docker/utils/rootfs/opt/app-root/src/sendmail.py
@@ -0,0 +1,70 @@
+#!/bin/env python3
+"""
+    Utilty to send an email.
+
+    Primarily useful to quickly generate test messages to e.g. troubleshoot mail delivery.
+
+    ./sendmail.py --sender-username admin@kolab.local --sender-password test123 --to test@kolab.org --subject 'test4' --body 'test4'"""
+from datetime import datetime
+import argparse
+import sys
+import smtplib
+import uuid
+
+
+mailtemplate = '''
+MIME-Version: 1.0
+Content-Type: text/plain;
+Date: {date}
+From: {sender}
+To: {to}
+Subject: {subject}
+Message-ID: {messageid}
+
+{body}
+'''.strip()
+
+
+
+class SendMail:
+    def __init__(self, options):
+        self.sender_username = options.sender_username
+        self.sender_password = options.sender_password
+        self.to = options.to
+
+        self.uuid = str(uuid.uuid4())
+        self.subject = options.subject
+        self.body = options.body
+
+    def send_mail(self):
+        dtstamp = datetime.utcnow()
+        msg = mailtemplate.format(
+            messageid="<{}@sendmail.py>".format(self.uuid),
+            subject=self.subject,
+            body=self.body,
+            sender=self.sender_username,
+            to=self.to,
+            date=dtstamp.strftime("%a, %d %b %Y %H:%M:%S %z"),
+        )
+        with smtplib.SMTP(host="postfix", port=10587) as smtp:
+            smtp.starttls()
+            smtp.ehlo()
+            smtp.login(self.sender_username, self.sender_password)
+            smtp.noop()
+            smtp.sendmail(self.sender_username, self.to, msg)
+            print(f"Email with uuid {self.uuid} sent")
+
+
+parser = argparse.ArgumentParser(description='Mail transport tests.')
+parser.add_argument('--sender-username', help='The SMTP sender username')
+parser.add_argument('--sender-password', help='The SMTP sender password')
+parser.add_argument('--to', help='The IMAP recipient username')
+parser.add_argument('--subject', help='Subject')
+parser.add_argument('--body', help='Body')
+
+args = parser.parse_args()
+
+obj = SendMail(args)
+obj.send_mail()
+
+sys.exit(0)