From f0dcf66167b953bf43cfec9286ec95d79af930e2 Mon Sep 17 00:00:00 2001
From: b-saikrishnakanth <130811169+b-saikrishnakanth@users.noreply.github.com>
Date: Tue, 17 Feb 2026 00:44:52 +0530
Subject: [PATCH] [WEB-5917] fix: generate clean plain text from HTML email
 template #8535

---
 .../api/plane/bgtasks/analytic_plot_export.py |  4 +-
 .../plane/bgtasks/email_notification_task.py  |  4 +-
 .../api/plane/bgtasks/forgot_password_task.py |  4 +-
 .../api/plane/bgtasks/magic_link_code_task.py |  4 +-
 .../bgtasks/project_add_user_email_task.py    |  4 +-
 .../plane/bgtasks/project_invitation_task.py  |  4 +-
 .../bgtasks/user_activation_email_task.py     |  4 +-
 .../bgtasks/user_deactivation_email_task.py   |  4 +-
 .../plane/bgtasks/user_email_update_task.py   |  6 +--
 apps/api/plane/bgtasks/webhook_task.py        |  4 +-
 .../bgtasks/workspace_invitation_task.py      |  4 +-
 apps/api/plane/utils/email.py                 | 42 +++++++++++++++++++
 12 files changed, 65 insertions(+), 23 deletions(-)
 create mode 100644 apps/api/plane/utils/email.py

diff --git a/apps/api/plane/bgtasks/analytic_plot_export.py b/apps/api/plane/bgtasks/analytic_plot_export.py
index e36314af6e..4b0983138b 100644
--- a/apps/api/plane/bgtasks/analytic_plot_export.py
+++ b/apps/api/plane/bgtasks/analytic_plot_export.py
@@ -13,7 +13,6 @@ from celery import shared_task
 # Django imports
 from django.core.mail import EmailMultiAlternatives, get_connection
 from django.template.loader import render_to_string
-from django.utils.html import strip_tags
 from django.db.models import Q, Case, Value, When
 from django.db import models
 from django.db.models.functions import Concat
@@ -22,6 +21,7 @@ from django.db.models.functions import Concat
 from plane.db.models import Issue
 from plane.license.utils.instance_value import get_email_configuration
 from plane.utils.analytics_plot import build_graph_plot
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 from plane.utils.issue_filters import issue_filters
 from plane.utils.csv_utils import sanitize_csv_row
@@ -53,7 +53,7 @@ def send_export_email(email, slug, csv_buffer, rows):
     """Helper function to send export email."""
     subject = "Your Export is ready"
     html_content = render_to_string("emails/exports/analytics.html", {})
-    text_content = strip_tags(html_content)
+    text_content = generate_plain_text_from_html(html_content)
 
     csv_buffer.seek(0)
 
diff --git a/apps/api/plane/bgtasks/email_notification_task.py b/apps/api/plane/bgtasks/email_notification_task.py
index 19db897462..5cf1d52af9 100644
--- a/apps/api/plane/bgtasks/email_notification_task.py
+++ b/apps/api/plane/bgtasks/email_notification_task.py
@@ -15,12 +15,12 @@ from django.template.loader import render_to_string
 
 # Django imports
 from django.utils import timezone
-from django.utils.html import strip_tags
 
 # Module imports
 from plane.db.models import EmailNotificationLog, Issue, User
 from plane.license.utils.instance_value import get_email_configuration
 from plane.settings.redis import redis_instance
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 
 
@@ -260,7 +260,7 @@ def send_email_notification(issue_id, notification_data, receiver_id, email_noti
                 "entity_type": "issue",
             }
             html_content = render_to_string("emails/notifications/issue-updates.html", context)
-            text_content = strip_tags(html_content)
+            text_content = generate_plain_text_from_html(html_content)
 
             try:
                 connection = get_connection(
diff --git a/apps/api/plane/bgtasks/forgot_password_task.py b/apps/api/plane/bgtasks/forgot_password_task.py
index 4a66551ed9..9ca0548de2 100644
--- a/apps/api/plane/bgtasks/forgot_password_task.py
+++ b/apps/api/plane/bgtasks/forgot_password_task.py
@@ -12,10 +12,10 @@ from celery import shared_task
 # Third party imports
 from django.core.mail import EmailMultiAlternatives, get_connection
 from django.template.loader import render_to_string
-from django.utils.html import strip_tags
 
 # Module imports
 from plane.license.utils.instance_value import get_email_configuration
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 
 
@@ -45,7 +45,7 @@ def forgot_password(first_name, email, uidb64, token, current_site):
 
         html_content = render_to_string("emails/auth/forgot_password.html", context)
 
-        text_content = strip_tags(html_content)
+        text_content = generate_plain_text_from_html(html_content)
 
         connection = get_connection(
             host=EMAIL_HOST,
diff --git a/apps/api/plane/bgtasks/magic_link_code_task.py b/apps/api/plane/bgtasks/magic_link_code_task.py
index 01adc1bd4a..eef7adea03 100644
--- a/apps/api/plane/bgtasks/magic_link_code_task.py
+++ b/apps/api/plane/bgtasks/magic_link_code_task.py
@@ -12,10 +12,10 @@ from celery import shared_task
 # Third party imports
 from django.core.mail import EmailMultiAlternatives, get_connection
 from django.template.loader import render_to_string
-from django.utils.html import strip_tags
 
 # Module imports
 from plane.license.utils.instance_value import get_email_configuration
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 
 
@@ -37,7 +37,7 @@ def magic_link(email, key, token):
         context = {"code": token, "email": email}
 
         html_content = render_to_string("emails/auth/magic_signin.html", context)
-        text_content = strip_tags(html_content)
+        text_content = generate_plain_text_from_html(html_content)
 
         connection = get_connection(
             host=EMAIL_HOST,
diff --git a/apps/api/plane/bgtasks/project_add_user_email_task.py b/apps/api/plane/bgtasks/project_add_user_email_task.py
index 83b034bb35..1efe6bc461 100644
--- a/apps/api/plane/bgtasks/project_add_user_email_task.py
+++ b/apps/api/plane/bgtasks/project_add_user_email_task.py
@@ -11,11 +11,11 @@ from celery import shared_task
 # Third party imports
 from django.core.mail import EmailMultiAlternatives, get_connection
 from django.template.loader import render_to_string
-from django.utils.html import strip_tags
 
 
 # Module imports
 from plane.license.utils.instance_value import get_email_configuration
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 from plane.db.models import ProjectMember
 from plane.db.models import User
@@ -59,7 +59,7 @@ def project_add_user_email(current_site, project_member_id, invitor_id):
 
         # Render the email template
         html_content = render_to_string("emails/notifications/project_addition.html", context)
-        text_content = strip_tags(html_content)
+        text_content = generate_plain_text_from_html(html_content)
         # Initialize the connection
         connection = get_connection(
             host=EMAIL_HOST,
diff --git a/apps/api/plane/bgtasks/project_invitation_task.py b/apps/api/plane/bgtasks/project_invitation_task.py
index 6876bd9f64..7b47df4a02 100644
--- a/apps/api/plane/bgtasks/project_invitation_task.py
+++ b/apps/api/plane/bgtasks/project_invitation_task.py
@@ -12,11 +12,11 @@ from celery import shared_task
 # Third party imports
 from django.core.mail import EmailMultiAlternatives, get_connection
 from django.template.loader import render_to_string
-from django.utils.html import strip_tags
 
 # Module imports
 from plane.db.models import Project, ProjectMemberInvite, User
 from plane.license.utils.instance_value import get_email_configuration
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 
 
@@ -41,7 +41,7 @@ def project_invitation(email, project_id, token, current_site, invitor):
 
         html_content = render_to_string("emails/invitations/project_invitation.html", context)
 
-        text_content = strip_tags(html_content)
+        text_content = generate_plain_text_from_html(html_content)
 
         project_member_invite.message = text_content
         project_member_invite.save()
diff --git a/apps/api/plane/bgtasks/user_activation_email_task.py b/apps/api/plane/bgtasks/user_activation_email_task.py
index 1f9b46beda..f7a2d3999a 100644
--- a/apps/api/plane/bgtasks/user_activation_email_task.py
+++ b/apps/api/plane/bgtasks/user_activation_email_task.py
@@ -8,7 +8,6 @@ import logging
 # Django imports
 from django.core.mail import EmailMultiAlternatives, get_connection
 from django.template.loader import render_to_string
-from django.utils.html import strip_tags
 
 # Third party imports
 from celery import shared_task
@@ -16,6 +15,7 @@ from celery import shared_task
 # Module imports
 from plane.db.models import User
 from plane.license.utils.instance_value import get_email_configuration
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 
 
@@ -31,7 +31,7 @@ def user_activation_email(current_site, user_id):
         # Send email to user
         html_content = render_to_string("emails/user/user_activation.html", context)
 
-        text_content = strip_tags(html_content)
+        text_content = generate_plain_text_from_html(html_content)
         # Configure email connection from the database
         (
             EMAIL_HOST,
diff --git a/apps/api/plane/bgtasks/user_deactivation_email_task.py b/apps/api/plane/bgtasks/user_deactivation_email_task.py
index bf27105855..81419606a7 100644
--- a/apps/api/plane/bgtasks/user_deactivation_email_task.py
+++ b/apps/api/plane/bgtasks/user_deactivation_email_task.py
@@ -8,7 +8,6 @@ import logging
 # Django imports
 from django.core.mail import EmailMultiAlternatives, get_connection
 from django.template.loader import render_to_string
-from django.utils.html import strip_tags
 
 # Third party imports
 from celery import shared_task
@@ -16,6 +15,7 @@ from celery import shared_task
 # Module imports
 from plane.db.models import User
 from plane.license.utils.instance_value import get_email_configuration
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 
 
@@ -31,7 +31,7 @@ def user_deactivation_email(current_site, user_id):
         # Send email to user
         html_content = render_to_string("emails/user/user_deactivation.html", context)
 
-        text_content = strip_tags(html_content)
+        text_content = generate_plain_text_from_html(html_content)
         # Configure email connection from the database
         (
             EMAIL_HOST,
diff --git a/apps/api/plane/bgtasks/user_email_update_task.py b/apps/api/plane/bgtasks/user_email_update_task.py
index ee45f5b74c..48b9c02dba 100644
--- a/apps/api/plane/bgtasks/user_email_update_task.py
+++ b/apps/api/plane/bgtasks/user_email_update_task.py
@@ -11,10 +11,10 @@ from celery import shared_task
 # Django imports
 from django.core.mail import EmailMultiAlternatives, get_connection
 from django.template.loader import render_to_string
-from django.utils.html import strip_tags
 
 # Module imports
 from plane.license.utils.instance_value import get_email_configuration
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 
 
@@ -36,7 +36,7 @@ def send_email_update_magic_code(email, token):
         context = {"code": token, "email": email}
 
         html_content = render_to_string("emails/auth/magic_signin.html", context)
-        text_content = strip_tags(html_content)
+        text_content = generate_plain_text_from_html(html_content)
 
         connection = get_connection(
             host=EMAIL_HOST,
@@ -87,7 +87,7 @@ def send_email_update_confirmation(email):
         context = {"email": email}
 
         html_content = render_to_string("emails/user/email_updated.html", context)
-        text_content = strip_tags(html_content)
+        text_content = generate_plain_text_from_html(html_content)
 
         connection = get_connection(
             host=EMAIL_HOST,
diff --git a/apps/api/plane/bgtasks/webhook_task.py b/apps/api/plane/bgtasks/webhook_task.py
index 5da4587cea..6543c3845b 100644
--- a/apps/api/plane/bgtasks/webhook_task.py
+++ b/apps/api/plane/bgtasks/webhook_task.py
@@ -20,7 +20,6 @@ from django.db.models import Prefetch
 from django.core.mail import EmailMultiAlternatives, get_connection
 from django.core.serializers.json import DjangoJSONEncoder
 from django.template.loader import render_to_string
-from django.utils.html import strip_tags
 from django.core.exceptions import ObjectDoesNotExist
 
 # Module imports
@@ -51,6 +50,7 @@ from plane.db.models import (
     IssueAssignee,
 )
 from plane.license.utils.instance_value import get_email_configuration
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 from plane.settings.mongo import MongoConnection
 
@@ -222,7 +222,7 @@ def send_webhook_deactivation_email(webhook_id: str, receiver_id: str, current_s
             "webhook_url": f"{current_site}/{str(webhook.workspace.slug)}/settings/webhooks/{str(webhook.id)}",
         }
         html_content = render_to_string("emails/notifications/webhook-deactivate.html", context)
-        text_content = strip_tags(html_content)
+        text_content = generate_plain_text_from_html(html_content)
 
         # Set the email connection
         connection = get_connection(
diff --git a/apps/api/plane/bgtasks/workspace_invitation_task.py b/apps/api/plane/bgtasks/workspace_invitation_task.py
index 9e9a17c2f3..f293cc16f8 100644
--- a/apps/api/plane/bgtasks/workspace_invitation_task.py
+++ b/apps/api/plane/bgtasks/workspace_invitation_task.py
@@ -11,11 +11,11 @@ from celery import shared_task
 # Django imports
 from django.core.mail import EmailMultiAlternatives, get_connection
 from django.template.loader import render_to_string
-from django.utils.html import strip_tags
 
 # Module imports
 from plane.db.models import User, Workspace, WorkspaceMemberInvite
 from plane.license.utils.instance_value import get_email_configuration
+from plane.utils.email import generate_plain_text_from_html
 from plane.utils.exception_logger import log_exception
 
 
@@ -57,7 +57,7 @@ def workspace_invitation(email, workspace_id, token, current_site, inviter):
 
         html_content = render_to_string("emails/invitations/workspace_invitation.html", context)
 
-        text_content = strip_tags(html_content)
+        text_content = generate_plain_text_from_html(html_content)
 
         workspace_member_invite.message = text_content
         workspace_member_invite.save()
diff --git a/apps/api/plane/utils/email.py b/apps/api/plane/utils/email.py
new file mode 100644
index 0000000000..f950e94515
--- /dev/null
+++ b/apps/api/plane/utils/email.py
@@ -0,0 +1,42 @@
+# SPDX-FileCopyrightText: 2023-present Plane Software, Inc.
+# SPDX-License-Identifier: LicenseRef-Plane-Commercial
+#
+# Licensed under the Plane Commercial License (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# https://plane.so/legals/eula
+#
+# DO NOT remove or modify this notice.
+# NOTICE: Proprietary and confidential. Unauthorized use or distribution is prohibited.
+
+# Python imports
+import re
+
+# Django imports
+from django.utils.html import strip_tags
+
+
+def generate_plain_text_from_html(html_content):
+    """
+    Generate clean plain text from HTML email template.
+    Removes all HTML tags, CSS styles, and excessive whitespace.
+
+    Args:
+        html_content (str): The HTML content to convert to plain text
+
+    Returns:
+        str: Clean plain text without HTML tags, styles, or excessive whitespace
+    """
+    # Remove style tags and their content
+    html_content = re.sub(r"<style[^>]*>.*?</style>", "", html_content, flags=re.DOTALL | re.IGNORECASE)
+
+    # Strip HTML tags
+    text_content = strip_tags(html_content)
+
+    # Remove excessive empty lines
+    text_content = re.sub(r"\n\s*\n\s*\n+", "\n\n", text_content)
+
+    # Ensure there's a leading and trailing whitespace
+    text_content = "\n\n" + text_content.lstrip().rstrip() + "\n\n"
+
+    return text_content