diff --git a/isso/css/isso.css b/isso/css/isso.css
index 47cf675..b7fe4b1 100644
--- a/isso/css/isso.css
+++ b/isso/css/isso.css
@@ -209,6 +209,10 @@
 .isso-postbox > .form-wrapper > .auth-section .post-action > input:active {
     background-color: #BBB;
 }
+.isso-postbox > .form-wrapper > .notification-section {
+    display: none;
+    padding-bottom: 10px;
+}
 @media screen and (max-width:600px) {
     .isso-postbox > .form-wrapper > .auth-section .input-wrapper {
         display: block;
diff --git a/isso/db/comments.py b/isso/db/comments.py
index 0f359a3..3110d25 100644
--- a/isso/db/comments.py
+++ b/isso/db/comments.py
@@ -23,7 +23,7 @@ class Comments:
               'mode',  # status of the comment 1 = valid, 2 = pending,
                        # 4 = soft-deleted (cannot hard delete because of replies)
               'remote_addr', 'text', 'author', 'email', 'website',
-              'likes', 'dislikes', 'voters']
+              'likes', 'dislikes', 'voters', 'notification']
 
     def __init__(self, db):
 
@@ -33,7 +33,8 @@ class Comments:
             '    tid REFERENCES threads(id), id INTEGER PRIMARY KEY, parent INTEGER,',
             '    created FLOAT NOT NULL, modified FLOAT, mode INTEGER, remote_addr VARCHAR,',
             '    text VARCHAR, author VARCHAR, email VARCHAR, website VARCHAR,',
-            '    likes INTEGER DEFAULT 0, dislikes INTEGER DEFAULT 0, voters BLOB NOT NULL);'])
+            '    likes INTEGER DEFAULT 0, dislikes INTEGER DEFAULT 0, voters BLOB NOT NULL,',
+            '    notification INTEGER NOT NULL DEFAULT 0);'])
 
     def add(self, uri, c):
         """
@@ -50,16 +51,16 @@ class Comments:
             'INSERT INTO comments (',
             '    tid, parent,'
             '    created, modified, mode, remote_addr,',
-            '    text, author, email, website, voters )',
+            '    text, author, email, website, voters, notification)',
             'SELECT',
             '    threads.id, ?,',
             '    ?, ?, ?, ?,',
-            '    ?, ?, ?, ?, ?',
+            '    ?, ?, ?, ?, ?, ?',
             'FROM threads WHERE threads.uri = ?;'], (
             c.get('parent'),
             c.get('created') or time.time(), None, c["mode"], c['remote_addr'],
             c['text'], c.get('author'), c.get('email'), c.get('website'), buffer(
-                Bloomfilter(iterable=[c['remote_addr']]).array),
+                Bloomfilter(iterable=[c['remote_addr']]).array), c.get('notification'),
             uri)
         )
 
diff --git a/isso/ext/notifications.py b/isso/ext/notifications.py
index 80e1504..38fa173 100644
--- a/isso/ext/notifications.py
+++ b/isso/ext/notifications.py
@@ -88,7 +88,7 @@ class SMTP(object):
     def __iter__(self):
         yield "comments.new:after-save", self.notify
 
-    def format(self, thread, comment):
+    def format(self, thread, comment, admin=False):
 
         rv = io.StringIO()
 
@@ -101,40 +101,51 @@ class SMTP(object):
         rv.write(comment["text"] + "\n")
         rv.write("\n")
 
-        if comment["website"]:
-            rv.write("User's URL: %s\n" % comment["website"])
+        if admin:
+            if comment["website"]:
+                rv.write("User's URL: %s\n" % comment["website"])
 
-        rv.write("IP address: %s\n" % comment["remote_addr"])
-        rv.write("Link to comment: %s\n" %
-                 (local("origin") + thread["uri"] + "#isso-%i" % comment["id"]))
-        rv.write("\n")
+            rv.write("IP address: %s\n" % comment["remote_addr"])
+            rv.write("Link to comment: %s\n" %
+                     (local("origin") + thread["uri"] + "#isso-%i" % comment["id"]))
+            rv.write("\n")
 
-        uri = local("host") + "/id/%i" % comment["id"]
-        key = self.isso.sign(comment["id"])
+            uri = local("host") + "/id/%i" % comment["id"]
+            key = self.isso.sign(comment["id"])
 
-        rv.write("---\n")
-        rv.write("Delete comment: %s\n" % (uri + "/delete/" + key))
+            rv.write("---\n")
+            rv.write("Delete comment: %s\n" % (uri + "/delete/" + key))
 
-        if comment["mode"] == 2:
-            rv.write("Activate comment: %s\n" % (uri + "/activate/" + key))
+            if comment["mode"] == 2:
+                rv.write("Activate comment: %s\n" % (uri + "/activate/" + key))
 
         rv.seek(0)
         return rv.read()
 
     def notify(self, thread, comment):
-
-        body = self.format(thread, comment)
-
+        if "parent" in comment:
+            comment_parent = self.isso.db.comments.get(comment["parent"])
+            # Notify the author that a new comment is posted if requested
+            if comment_parent and "email" in comment_parent and comment_parent["notification"]:
+                body = self.format(thread, comment, admin=False)
+                subject = "Re: New comment posted on %s" % thread["title"]
+                self.sendmail(subject, body, thread, comment, to=comment_parent["email"])
+
+        body = self.format(thread, comment, admin=True)
+        self.sendmail(thread["title"], body, thread, comment)
+
+    def sendmail(self, subject, body, thread, comment, to=None):
         if uwsgi:
-            uwsgi.spool({b"subject": thread["title"].encode("utf-8"),
-                         b"body": body.encode("utf-8")})
+            uwsgi.spool({b"subject": subject.encode("utf-8"),
+                         b"body": body.encode("utf-8"),
+                         b"to": to})
         else:
-            start_new_thread(self._retry, (thread["title"], body))
+            start_new_thread(self._retry, (subject, body, to))
 
-    def _sendmail(self, subject, body):
+    def _sendmail(self, subject, body, to=None):
 
         from_addr = self.conf.get("from")
-        to_addr = self.conf.get("to")
+        to_addr = to or self.conf.get("to")
 
         msg = MIMEText(body, 'plain', 'utf-8')
         msg['From'] = from_addr
@@ -145,10 +156,10 @@ class SMTP(object):
         with self as con:
             con.sendmail(from_addr, to_addr, msg.as_string())
 
-    def _retry(self, subject, body):
+    def _retry(self, subject, body, to):
         for x in range(5):
             try:
-                self._sendmail(subject, body)
+                self._sendmail(subject, body, to)
             except smtplib.SMTPConnectError:
                 time.sleep(60)
             else:
diff --git a/isso/js/app/dom.js b/isso/js/app/dom.js
index ec76e13..05363e3 100644
--- a/isso/js/app/dom.js
+++ b/isso/js/app/dom.js
@@ -90,6 +90,8 @@ define(function() {
         this.focus = function() { node.focus() };
         this.scrollIntoView = function(args) { node.scrollIntoView(args) };
 
+        this.checked = function() { return node.checked; };
+
         this.setAttribute = function(key, value) { node.setAttribute(key, value) };
         this.getAttribute = function(key) { return node.getAttribute(key) };
 
diff --git a/isso/js/app/i18n/en.js b/isso/js/app/i18n/en.js
index ec4b4d0..7ba8b49 100644
--- a/isso/js/app/i18n/en.js
+++ b/isso/js/app/i18n/en.js
@@ -4,6 +4,7 @@ define({
     "postbox-email": "E-mail (optional)",
     "postbox-website": "Website (optional)",
     "postbox-submit": "Submit",
+    "postbox-notification": "Subscribe to email notification of replies",
 
     "num-comments": "One Comment\n{{ n }} Comments",
     "no-comments": "No Comments Yet",
diff --git a/isso/js/app/i18n/fr.js b/isso/js/app/i18n/fr.js
index e29d024..2f2573b 100644
--- a/isso/js/app/i18n/fr.js
+++ b/isso/js/app/i18n/fr.js
@@ -4,6 +4,7 @@ define({
     "postbox-email": "Courriel (optionnel)",
     "postbox-website": "Site web (optionnel)",
     "postbox-submit": "Soumettre",
+    "postbox-notification": "S'abonner aux notifications de réponses",
     "num-comments": "{{ n }} commentaire\n{{ n }} commentaires",
     "no-comments": "Aucun commentaire pour l'instant",
     "comment-reply": "Répondre",
diff --git a/isso/js/app/isso.js b/isso/js/app/isso.js
index e779a76..665db73 100644
--- a/isso/js/app/isso.js
+++ b/isso/js/app/isso.js
@@ -39,6 +39,17 @@ define(["app/dom", "app/utils", "app/config", "app/api", "app/jade", "app/i18n",
             return true;
         };
 
+        // only display notification checkbox if email is filled in
+        var email_edit = function() {
+            if ($("[name='email']", el).value.length > 0) {
+                $(".notification-section", el).show();
+            } else {
+                $(".notification-section", el).hide();
+            }
+        };
+        $("[name='email']", el).on("input", email_edit);
+        email_edit();
+
         // email is not optional if this config parameter is set
         if (config["require-email"]) {
             $("[name='email']", el).setAttribute("placeholder",
@@ -70,7 +81,8 @@ define(["app/dom", "app/utils", "app/config", "app/api", "app/jade", "app/i18n",
                 author: author, email: email, website: website,
                 text: utils.text($(".textarea", el).innerHTML),
                 parent: parent || null,
-                title: $("#isso-thread").getAttribute("data-title") || null
+                title: $("#isso-thread").getAttribute("data-title") || null,
+                notification: $("[name=notification]", el).checked() ? 1 : 0,
             }).then(function(comment) {
                 $(".textarea", el).innerHTML = "";
                 $(".textarea", el).blur();
diff --git a/isso/js/app/text/postbox.jade b/isso/js/app/text/postbox.jade
index 0a85ae1..bc7ef02 100644
--- a/isso/js/app/text/postbox.jade
+++ b/isso/js/app/text/postbox.jade
@@ -15,3 +15,7 @@ div(class='isso-postbox')
                       value=website != null ? '#{website}' : '')
             p(class='post-action')
                 input(type='submit' value=i18n('postbox-submit'))
+        section(class='notification-section')
+                label
+                    input(type='checkbox' name='notification')
+                    = i18n('postbox-notification')
diff --git a/isso/views/comments.py b/isso/views/comments.py
index d3b80c3..c95026e 100644
--- a/isso/views/comments.py
+++ b/isso/views/comments.py
@@ -81,10 +81,10 @@ def xhr(func):
 class API(object):
 
     FIELDS = set(['id', 'parent', 'text', 'author', 'website',
-                  'mode', 'created', 'modified', 'likes', 'dislikes', 'hash'])
+                  'mode', 'created', 'modified', 'likes', 'dislikes', 'hash', 'notification'])
 
     # comment fields, that can be submitted
-    ACCEPT = set(['text', 'author', 'website', 'email', 'parent', 'title'])
+    ACCEPT = set(['text', 'author', 'website', 'email', 'parent',  'title', 'notification'])
 
     VIEWS = [
         ('fetch',   ('GET', '/')),