diff --git a/app/CONTRIBUTING.md b/app/CONTRIBUTING.md
index c8b726e..637d2fd 100644
--- a/app/CONTRIBUTING.md
+++ b/app/CONTRIBUTING.md
@@ -169,6 +169,12 @@ For HTML templates, we use `djlint`. Before creating a pull request, please run
 poetry run djlint --check templates
 ```
 
+If some files aren't properly formatted, you can format all files with
+
+```bash
+poetry run djlint --reformat .
+```
+
 ## Test sending email
 
 [swaks](http://www.jetmore.org/john/code/swaks/) is used for sending test emails to the `email_handler`.
diff --git a/app/app/handler/unsubscribe_encoder.py b/app/app/handler/unsubscribe_encoder.py
index bc07942..1f878b4 100644
--- a/app/app/handler/unsubscribe_encoder.py
+++ b/app/app/handler/unsubscribe_encoder.py
@@ -74,8 +74,8 @@ class UnsubscribeEncoder:
         )
         signed_data = cls._get_signer().sign(serialized_data).decode("utf-8")
         encoded_request = f"{UNSUB_PREFIX}.{signed_data}"
-        if len(encoded_request) > 256:
-            LOG.e("Encoded request is longer than 256 chars")
+        if len(encoded_request) > 512:
+            LOG.w("Encoded request is longer than 512 chars")
         return encoded_request
 
     @staticmethod
diff --git a/app/app/mail_sender.py b/app/app/mail_sender.py
index 7aba370..12b60ee 100644
--- a/app/app/mail_sender.py
+++ b/app/app/mail_sender.py
@@ -46,6 +46,7 @@ class SendRequest:
             "mail_options": self.mail_options,
             "rcpt_options": self.rcpt_options,
             "is_forward": self.is_forward,
+            "retries": self.retries,
         }
         return json.dumps(data).encode("utf-8")
 
@@ -66,6 +67,7 @@ class SendRequest:
             mail_options=decoded_data["mail_options"],
             rcpt_options=decoded_data["rcpt_options"],
             is_forward=decoded_data["is_forward"],
+            retries=decoded_data.get("retries", 1),
         )
 
     def save_request_to_unsent_dir(self, prefix: str = "DeliveryFail"):
diff --git a/app/templates/auth/register.html b/app/templates/auth/register.html
index bf2f0a7..e081c90 100644
--- a/app/templates/auth/register.html
+++ b/app/templates/auth/register.html
@@ -9,10 +9,13 @@
       <h1 class="card-title">Create new account</h1>
       <div class="form-group">
         <label class="form-label">Email address</label>
-        {{ form.email(class="form-control", type="email") }}
+        {{ form.email(class="form-control", type="email", placeholder="YourName@protonmail.com") }}
         <div class="small-text alert alert-info" style="margin-top: 1px">
           Emails sent to your alias will be forwarded to this email address.
+          <br>
           It can't be a disposable or forwarding email address.
+          <br>
+          We recommend using a <a href="https://proton.me/mail" target="_blank">Proton Mail</a> address
         </div>
         {{ render_field_errors(form.email) }}
       </div>
diff --git a/app/templates/single.html b/app/templates/single.html
index df8e408..0d44092 100644
--- a/app/templates/single.html
+++ b/app/templates/single.html
@@ -5,7 +5,7 @@
   <div class="page-single">
     <div class="container">
       <div class="row">
-        <div class="col mx-auto" style="max-width: 28rem">
+        <div class="col mx-auto" style="max-width: 32rem">
           <div class="text-center mb-6">
             <a href="{{ LANDING_PAGE_URL }}">
               <img src="/static/logo.svg"