diff --git a/htmx/app.py b/htmx/app.py
index 57ed5b5..cbe12d7 100644
--- a/htmx/app.py
+++ b/htmx/app.py
@@ -1,9 +1,12 @@
+import email.message
+import json
 import logging
+import smtplib
 import uuid
 import psycopg2
 import psycopg2.extras
 
-from flask import Flask, request, render_template, render_template_string, session, g
+from flask import Flask, request, render_template, render_template_string, session, g, url_for
 from flask_babel import Babel, _
 
 logging.basicConfig(format="%(asctime)s %(levelname)s %(name)s %(lineno)d | %(message)s", level=logging.DEBUG)
@@ -135,20 +138,34 @@ def result(public_id):
                 stats["band_rank"] = r["rank"]
                 stats["band_count"] = r["c"]
 
-    ask_mail = session["uuid"].endswith(public_id)
-    log.debug("uuid = %s, public_id=%s, ask_mail=%s", session["uuid"], public_id, ask_mail)
+    uuid = session.get("uuid", "")
+    ask_mail = uuid.endswith(public_id)
+    log.debug("uuid = %s, public_id=%s, ask_mail=%s", uuid, public_id, ask_mail)
     return render_template("result.html", public_id=public_id, stats=stats, ask_mail=ask_mail)
 
 @app.route("/add-email", methods=["POST"])
 def add_email():
     csr = get_cursor()
-    csr.execute("update users set email=%s where uuid = %s", (request.form["email"], session["uuid"],))
+    csr.execute("update users set email=%s, lang=%s, confirmation_sent_ts=now() where uuid = %s",
+                (request.form["email"], get_locale(), session["uuid"],))
     if csr.rowcount:
+        send_mail(request.form["email"], session["uuid"])
         return render_template_string(_("Saved. Expect mail at {{email}}"),
                                       email=request.form["email"])
     else:
         return _("<span>You don't exist. Go away!</span>")
 
+@app.route("/confirm-email/<uuid>", methods=["GET"])
+def confirm_email_ask(uuid):
+    return render_template("confirm.html", uuid=uuid)
+
+@app.route("/confirm-email/<uuid>", methods=["POST"])
+def confirm_email_do(uuid):
+    csr = get_cursor()
+    csr.execute("update users set confirmation_received_ts=now(), confirmation_info=%s where uuid=%s",
+                (json.dumps({"ip": request.remote_addr, "ua": request.user_agent.string}), uuid))
+    return "<p>" + _("Thanks!") + "</p>"
+
 # Middleware
 
 @babel.localeselector
@@ -188,10 +205,34 @@ def teardown_db(exception):
         db.close()
 
 def new_user():
+    lang = get_locale()
     user_uuid = str(uuid.uuid4())
     user_public_id = user_uuid[-12:]
     csr = get_cursor()
-    csr.execute("insert into users(uuid, public_id) values(%s, %s)", (user_uuid, user_public_id,))
+    csr.execute("insert into users(uuid, public_id, lang) values(%s, %s, %s)",
+                (user_uuid, user_public_id, lang))
     return user_uuid, user_public_id
 
+def send_mail(mailaddress, uuid):
+    msg = email.message.EmailMessage()
+    msg["From"] ="i12e@hjp.at"
+    msg["To"] = mailaddress
+    msg["Subject"] = _("The Musical Internatiionale: Confirm mail address")
+    confirmation_url = url_for("confirm_email_ask", uuid=uuid, _external=True)
+    body = _(
+        "Hello,\n"
+        "\n"
+        "somebody requested news about new developments at https://i12e.hjp.at/ to be sent to\n"
+        "{mailaddress}.\n"
+        "\n"
+        "To confirm that that this was you, please visit this url:\n"
+        "{url}\n"
+        "\n"
+        "With musical greetings\n"
+        "    I12E Bot\n"
+        "").format(mailaddress=mailaddress, url=confirmation_url)
+    msg.set_content(body)
+    mta = smtplib.SMTP(host="localhost")
+    mta.send_message(msg)
+
 # vim: tw=99
diff --git a/htmx/messages.pot b/htmx/messages.pot
index 7da1d0c..92ad7cf 100644
--- a/htmx/messages.pot
+++ b/htmx/messages.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2022-03-20 23:24+0100\n"
+"POT-Creation-Date: 2022-03-28 00:28+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -17,22 +17,49 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "Generated-By: Babel 2.9.1\n"
 
-#: app.py:22
+#: app.py:25
 msgid "hello"
 msgstr ""
 
-#: app.py:147
+#: app.py:153
 msgid "Saved. Expect mail at {{email}}"
 msgstr ""
 
-#: app.py:150
+#: app.py:156
 msgid "<span>You don't exist. Go away!</span>"
 msgstr ""
 
-#: templates/home.html:6 templates/result.html:6
+#: app.py:167
+msgid "Thanks!"
+msgstr ""
+
+#: app.py:220
+msgid "The Musical Internatiionale: Confirm mail address"
+msgstr ""
+
+#: app.py:222
+msgid ""
+"Hello,\n"
+"\n"
+"somebody requested news about new developments at https://i12e.hjp.at/ to"
+" be sent to\n"
+"{mailaddress}.\n"
+"\n"
+"To confirm that that this was you, please visit this url:\n"
+"{url}\n"
+"\n"
+"With musical greetings\n"
+"    I12E Bot\n"
+msgstr ""
+
+#: templates/confirm.html:6 templates/home.html:6 templates/result.html:6
 msgid "The Musical Internatiionale"
 msgstr ""
 
+#: templates/confirm.html:14
+msgid "I confirm that I want to receive mails about new developments at this site"
+msgstr ""
+
 #: templates/home.html:20
 msgid ""
 "All the countries in the world — which bands or solo musicians from these"
diff --git a/htmx/templates/confirm.html b/htmx/templates/confirm.html
new file mode 100644
index 0000000..ec8a348
--- /dev/null
+++ b/htmx/templates/confirm.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="UTF-8">
+    <title>
+      {{ _("The Musical Internatiionale") }}
+    </title>
+    <script src='https://unpkg.com/htmx.org@1.7.0'></script>
+    <link rel="stylesheet" href="/static/style.css">
+  </head>
+  <body>
+    <main>
+      <button class="btn" hx-post="{{url_for('confirm_email_do', uuid=uuid)}}" hx-swap="outerHTML">
+        {{_("I confirm that I want to receive mails about new developments at this site")}}
+      </button>
+    </main>
+  </body>
+</html>
diff --git a/htmx/translations/de/LC_MESSAGES/messages.mo b/htmx/translations/de/LC_MESSAGES/messages.mo
index 2826bad..3314fc5 100644
Binary files a/htmx/translations/de/LC_MESSAGES/messages.mo and b/htmx/translations/de/LC_MESSAGES/messages.mo differ
diff --git a/htmx/translations/de/LC_MESSAGES/messages.po b/htmx/translations/de/LC_MESSAGES/messages.po
index cf57a26..517d7c1 100644
--- a/htmx/translations/de/LC_MESSAGES/messages.po
+++ b/htmx/translations/de/LC_MESSAGES/messages.po
@@ -30,11 +30,50 @@ msgstr "Gespeichert. Du wirst Mail an {{email}} bekommen."
 msgid "<span>You don't exist. Go away!</span>"
 msgstr "Du existierst nicht. Verschwinde!"
 
+#: app.py:167
+msgid "Thanks!"
+msgstr "Danke!"
+
+#: app.py:206
+msgid "The Musical Internatiionale: Confirm mail address"
+msgstr "Die Musik-Internationale: Bestätigung der Mail-Adresse"
+
+#: app.py:207
+msgid ""
+"Hello,\n"
+"\n"
+"somebody requested news about new developments at https://i12e.hjp.at/ to"
+" be sent to\n"
+"{mailaddress}.\n"
+"\n"
+"To confirm that that this was you, please visit this url:\n"
+"{url}\n"
+"\n"
+"With musical greetings\n"
+"    I12E Bot\n"
+msgstr ""
+"Hallo!\n"
+"\n"
+"Jemand hat darum gebeten, dass Informationen über neue Entwicklungen "
+"auf https://i12e.hjp.at/ an\n"
+"{mailaddress}.\n"
+"geschickt werden.\n"
+"Um zu bestätigen, dass das Du warst, besuche bitte diesen URL:\n"
+"{url}\n"
+"\n"
+"With musical greetings\n"
+"    I12E Bot\n"
+
 #: templates/home.html:6
 msgid "The Musical Internatiionale"
 msgstr "Die Musik-Internationale"
 
 #: templates/home.html:21
+msgid "I confirm that I want to receive mails about new developments at this site"
+msgstr "Ich bestätige, dass im Mails über neue Entwicklungen auf dieser "
+"Website erhalen möchte"
+
+#: templates/home.html:20
 msgid ""
 "All the countries in the world — which bands or solo musicians from these"
 " countries do you know?"