Implement IMAP email-to-ticket gateway

templates/email/mailgateway_sender_mismatch.html.twig

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+{% block subject %}[{{ guest.system_company.name }}] Unable to process your support reply{% endblock %}
+{% block content %}
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <style type="text/css">
+        body {
+            font-family: Arial, sans-serif;
+            font-size: 14px;
+            color: #333333;
+            line-height: 1.6;
+        }
+
+        h1 {
+            font-size: 24px;
+            font-weight: bold;
+            margin: 0 0 20px;
+        }
+
+        p {
+            margin: 0 0 15px;
+        }
+
+        .notice {
+            background-color: #f7f7f7;
+            border-left: 4px solid #cc9900;
+            padding: 15px;
+            margin: 20px 0;
+        }
+
+        .signature {
+            font-style: italic;
+            color: #999999;
+            margin-top: 20px;
+            border-top: 1px solid #cccccc;
+            padding-top: 10px;
+        }
+    </style>
+</head>
+<body>
+
+    <h1>We couldn't process your reply</h1>
+
+    <p>Hello,</p>
+
+    <p>
+        Thank you for contacting {{ guest.system_company.name }}.
+    </p>
+
+    <p>
+        Unfortunately, we couldn't add your email to the support ticket
+        you replied to.
+    </p>
+
+    <div class="notice">
+        <p>
+            <strong>Please reply from the email address associated
+            with your account.</strong>
+        </p>
+
+        <p>
+            For security reasons, we can only accept email replies
+            from an address authorised to access the support ticket.
+        </p>
+    </div>
+
+    <p>
+        Your message has not been added to the ticket.
+        Please resend it using your registered email address.
+    </p>
+
+    <p>
+        If you no longer have access to that email address,
+        please log in to your account to update your details
+        or contact us for assistance.
+    </p>
+
+    <p>
+        Kind regards,
+    </p>
+
+    <div class="signature">
+        {{ guest.system_email.signature }}
+    </div>
+
+</body>
+</html>
+{% endblock %}