diff --git a/src/templates/emails/base_email.html b/src/templates/emails/base_email.html
index 9ea0c1a89..6e4c5e522 100644
--- a/src/templates/emails/base_email.html
+++ b/src/templates/emails/base_email.html
@@ -21,7 +21,10 @@
 	        background-color: #ffffff;
         }
         .header_img {
-            width: 40%;
+            width: 100%;
+            height: 100%;
+            object-fit: contain;
+            box-sizing: border-box;
         }
         .header {
             width: 100%;
@@ -31,6 +34,8 @@
             justify-content: center;
             align-items: center;
             margin-bottom: 10px;
+            padding: 10px;
+            box-sizing: border-box;
         }
         .content{
             padding: 20px;
@@ -105,13 +110,13 @@ <h3>Hello{% if user %} {{ user.username }}{% endif %},</h3>
     <p>Thanks,</p>
     <p>Codabench Team</p>
     <div class = "header">
-        <img class = "header_img" src = "../../static/img/codabench.png" alt = "codabench_logo" />
+        <img class = "header_img" src = "https://www.codabench.org/static/img/codabench.png" alt = "Codabench Logo" />
     </div>
 </div>
 {% endif %}
 </div>
 <div id="footer">
-    <p><a href="http://{{ site.domain }}">Unsubscribe or manage notification settings</a> | <a href="https://github.com/codalab/codalab-competitions/wiki/Privacy">Privacy policy</a></p>
+    <p><a href="https://github.com/codalab/codalab-competitions/wiki/Privacy">Privacy policy</a></p>
 </div>
 </div>
 </body>
diff --git a/src/templates/emails/participation/organizer/participation_accepted.html b/src/templates/emails/participation/organizer/participation_accepted.html
index f25d3dfc9..d0942e6c3 100644
--- a/src/templates/emails/participation/organizer/participation_accepted.html
+++ b/src/templates/emails/participation/organizer/participation_accepted.html
@@ -1,6 +1,10 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-    <p>We're writing to inform you that user {{ participant.user.username }} has been accepted into your competition
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.You can manage all participants from the admin panel of your competition.</p>
+    <p>
+        User <strong>{{ participant.user.username }}</strong> has been accepted into your competition
+        <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.
+        <br>
+        You can manage all participants from the admin panel of your competition.
+    </p>
 {% endblock %}
diff --git a/src/templates/emails/participation/organizer/participation_accepted.txt b/src/templates/emails/participation/organizer/participation_accepted.txt
index f25d3dfc9..d0942e6c3 100644
--- a/src/templates/emails/participation/organizer/participation_accepted.txt
+++ b/src/templates/emails/participation/organizer/participation_accepted.txt
@@ -1,6 +1,10 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-    <p>We're writing to inform you that user {{ participant.user.username }} has been accepted into your competition
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.You can manage all participants from the admin panel of your competition.</p>
+    <p>
+        User <strong>{{ participant.user.username }}</strong> has been accepted into your competition
+        <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.
+        <br>
+        You can manage all participants from the admin panel of your competition.
+    </p>
 {% endblock %}
diff --git a/src/templates/emails/participation/organizer/participation_denied.html b/src/templates/emails/participation/organizer/participation_denied.html
index 43ec224c0..6d19430e9 100644
--- a/src/templates/emails/participation/organizer/participation_denied.html
+++ b/src/templates/emails/participation/organizer/participation_denied.html
@@ -1,6 +1,10 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-<p>We're writing to inform you that user {{ participant.user.username }} has been denied to your competition
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.You can manage all participants from the admin panel of your competition.</p>
+<p>
+    A user <strong>{{ participant.user.username }}</strong> has been denied access to your competition.
+    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.
+    <br>
+    You can manage all participants from the admin panel of your competition.
+</p>
 {% endblock %}
diff --git a/src/templates/emails/participation/organizer/participation_denied.txt b/src/templates/emails/participation/organizer/participation_denied.txt
index 43ec224c0..6d19430e9 100644
--- a/src/templates/emails/participation/organizer/participation_denied.txt
+++ b/src/templates/emails/participation/organizer/participation_denied.txt
@@ -1,6 +1,10 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-<p>We're writing to inform you that user {{ participant.user.username }} has been denied to your competition
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.You can manage all participants from the admin panel of your competition.</p>
+<p>
+    A user <strong>{{ participant.user.username }}</strong> has been denied access to your competition.
+    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.
+    <br>
+    You can manage all participants from the admin panel of your competition.
+</p>
 {% endblock %}
diff --git a/src/templates/emails/participation/organizer/participation_requested.html b/src/templates/emails/participation/organizer/participation_requested.html
index dad10d911..9adfe5c73 100644
--- a/src/templates/emails/participation/organizer/participation_requested.html
+++ b/src/templates/emails/participation/organizer/participation_requested.html
@@ -1,6 +1,10 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-<p>We're writing to inform you that user {{ participant.user.username }} has requested access to your competition
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.You can manage all participants from the admin panel of your competition.</p>
+<p>
+    A user <strong>{{ participant.user.username }}</strong> has requested access to your competition
+    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.
+    <br>
+    You can manage all participants from the admin panel of your competition.
+</p>
 {% endblock %}
diff --git a/src/templates/emails/participation/organizer/participation_requested.txt b/src/templates/emails/participation/organizer/participation_requested.txt
index dad10d911..9adfe5c73 100644
--- a/src/templates/emails/participation/organizer/participation_requested.txt
+++ b/src/templates/emails/participation/organizer/participation_requested.txt
@@ -1,6 +1,10 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-<p>We're writing to inform you that user {{ participant.user.username }} has requested access to your competition
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.You can manage all participants from the admin panel of your competition.</p>
+<p>
+    A user <strong>{{ participant.user.username }}</strong> has requested access to your competition
+    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>.
+    <br>
+    You can manage all participants from the admin panel of your competition.
+</p>
 {% endblock %}
diff --git a/src/templates/emails/participation/participant/participation_accepted.html b/src/templates/emails/participation/participant/participation_accepted.html
index 27a0ddfd9..d125565df 100644
--- a/src/templates/emails/participation/participant/participation_accepted.html
+++ b/src/templates/emails/participation/participant/participation_accepted.html
@@ -1,10 +1,11 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-    <p>We're thrilled to inform you that your application for the
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
-    competition has been <b>accepted</b>. Get ready to showcase your skills and compete with other talented individuals.</p>
-    <p>We look forward to seeing your participation.</p>
+    <p>
+        Your application for the
+        <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
+        competition has been <b>accepted</b>. Get ready to showcase your skills and compete with other talented individuals.
+    </p>
 {% endblock %}
 
 
diff --git a/src/templates/emails/participation/participant/participation_accepted.txt b/src/templates/emails/participation/participant/participation_accepted.txt
index 27a0ddfd9..d125565df 100644
--- a/src/templates/emails/participation/participant/participation_accepted.txt
+++ b/src/templates/emails/participation/participant/participation_accepted.txt
@@ -1,10 +1,11 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-    <p>We're thrilled to inform you that your application for the
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
-    competition has been <b>accepted</b>. Get ready to showcase your skills and compete with other talented individuals.</p>
-    <p>We look forward to seeing your participation.</p>
+    <p>
+        Your application for the
+        <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
+        competition has been <b>accepted</b>. Get ready to showcase your skills and compete with other talented individuals.
+    </p>
 {% endblock %}
 
 
diff --git a/src/templates/emails/participation/participant/participation_denied.html b/src/templates/emails/participation/participant/participation_denied.html
index 23d4701be..9bef8c5ca 100644
--- a/src/templates/emails/participation/participant/participation_denied.html
+++ b/src/templates/emails/participation/participant/participation_denied.html
@@ -1,12 +1,10 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-    <p>We're writing to inform you about your application for the
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
-    competition. While your application was carefully considered, we regret to inform you that your participation privileges 
-    have been denied. We encourage you to review the competition details and rules to see if there are areas where you can 
-    improve your application for future competitions. </p>
-    <p>Thank you for your interest in the competition. We wish you the best of luck in your future endeavors.
+    <p>
+        Your application for the
+        <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
+        competition has been denied. You can reach out to the organizing team for more details.
     </p>
 
 {% endblock %}
diff --git a/src/templates/emails/participation/participant/participation_denied.txt b/src/templates/emails/participation/participant/participation_denied.txt
index 23d4701be..4b592667a 100644
--- a/src/templates/emails/participation/participant/participation_denied.txt
+++ b/src/templates/emails/participation/participant/participation_denied.txt
@@ -1,14 +1,11 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-    <p>We're writing to inform you about your application for the
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
-    competition. While your application was carefully considered, we regret to inform you that your participation privileges 
-    have been denied. We encourage you to review the competition details and rules to see if there are areas where you can 
-    improve your application for future competitions. </p>
-    <p>Thank you for your interest in the competition. We wish you the best of luck in your future endeavors.
+    <p>
+        Your application for the
+        <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
+        competition has been denied. You can reach out to the organizing team for more details.
     </p>
-
 {% endblock %}
 
 
diff --git a/src/templates/emails/participation/participant/participation_organizer_direct_email.html b/src/templates/emails/participation/participant/participation_organizer_direct_email.html
index 715d61d23..ad5b88dc1 100644
--- a/src/templates/emails/participation/participant/participation_organizer_direct_email.html
+++ b/src/templates/emails/participation/participant/participation_organizer_direct_email.html
@@ -1,13 +1,14 @@
 {% extends 'emails/base_email.html' %}
 
 {% block title %}
-    <p>This is a message from the organizer for the competition:</p>
-    <a href="http://{{ site.domain }}{{ competition.get_absolute_url }}">{{ competition }}</a>
-
+    <p>
+        This is a message from the organizer for the competition:
+        <a href="http://{{ site.domain }}{{ competition.get_absolute_url }}">{{ competition }}</a>
+    </p>
     <br><br>
 {% endblock %}
 
 {% block content %}
     <h3>Message:</h3>
-<pre>{{ body }}</pre>
+    <pre>{{ body }}</pre>
 {% endblock %}
diff --git a/src/templates/emails/participation/participant/participation_organizer_direct_email.txt b/src/templates/emails/participation/participant/participation_organizer_direct_email.txt
index ecb20a46a..44e044305 100644
--- a/src/templates/emails/participation/participant/participation_organizer_direct_email.txt
+++ b/src/templates/emails/participation/participant/participation_organizer_direct_email.txt
@@ -1,11 +1,14 @@
 {% extends 'emails/base_email.txt' %}
 
 {% block title %}
-This is a message from the organizer for the competition:
-{{ competition }} -> http://{{ site.domain }}{{ competition.get_absolute_url }}
+    <p>
+        This is a message from the organizer for the competition:
+        <a href="http://{{ site.domain }}{{ competition.get_absolute_url }}">{{ competition }}</a>
+    </p>
+    <br><br>
 {% endblock %}
 
 {% block content %}
-Message:
-{{ body }}
+    <h3>Message:</h3>
+    <pre>{{ body }}</pre>
 {% endblock %}
diff --git a/src/templates/emails/participation/participant/participation_requested.html b/src/templates/emails/participation/participant/participation_requested.html
index 582d174b5..3412695c7 100644
--- a/src/templates/emails/participation/participant/participation_requested.html
+++ b/src/templates/emails/participation/participant/participation_requested.html
@@ -1,12 +1,13 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-    <p>Thanks for your interest in the
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
-    competition. We have received your request to participate.</p>
-
-    <p>We will carefully review your application and notify you by email regarding your participation status (accepted or denied).
-    In the meantime, you can review the competition details and rules to familiarize yourself with the challenge. </p>
-    
-    <p>We look forward to your participation!</p>
+    <p>
+        Thank you for your interest in the
+        <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
+        competition. We have received your request to participate.
+    </p>
+    <p>
+        We will carefully review your application and notify you by email regarding your participation status (accepted or denied).
+        In the meantime, you can review the competition details and rules to familiarize yourself with the challenge.
+    </p>
 {% endblock %}
diff --git a/src/templates/emails/participation/participant/participation_requested.txt b/src/templates/emails/participation/participant/participation_requested.txt
index 582d174b5..3412695c7 100644
--- a/src/templates/emails/participation/participant/participation_requested.txt
+++ b/src/templates/emails/participation/participant/participation_requested.txt
@@ -1,12 +1,13 @@
 {% extends 'emails/base_email.html' %}
 
 {% block content %}
-    <p>Thanks for your interest in the
-    <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
-    competition. We have received your request to participate.</p>
-
-    <p>We will carefully review your application and notify you by email regarding your participation status (accepted or denied).
-    In the meantime, you can review the competition details and rules to familiarize yourself with the challenge. </p>
-    
-    <p>We look forward to your participation!</p>
+    <p>
+        Thank you for your interest in the
+        <a href="http://{{ site.domain }}{{ participant.competition.get_absolute_url }}">{{ participant.competition.title }}</a>
+        competition. We have received your request to participate.
+    </p>
+    <p>
+        We will carefully review your application and notify you by email regarding your participation status (accepted or denied).
+        In the meantime, you can review the competition details and rules to familiarize yourself with the challenge.
+    </p>
 {% endblock %}