diff --git a/formbox.py b/formbox.py
deleted file mode 100644
index cdb0c76..0000000
--- a/formbox.py
+++ /dev/null
@@ -1,73 +0,0 @@
-#!/usr/bin/env python
-# Format mbox as HTML/XML
-# Copyright (C) 2021  Nguyễn Gia Phong
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published
-# by the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-from argparse import ArgumentParser
-from email.header import decode_header
-from itertools import starmap
-from mailbox import mbox
-from pathlib import Path
-from urllib.parse import quote
-
-from bleach import clean, linkify
-from markdown import markdown
-
-markdown_tags = ["h1", "h2", "h3", "h4", "h5", "h6",
-                 "b", "i", "strong", "em", "tt",
-                 "p", "br",
-                 "blockquote", "code", "pre", "hr",
-                 "ul", "ol", "li", "dd", "dt",
-                 "a",
-                 "sub", "sup"]
-
-
-def extract(archive, parent):
-    for message_id, message in archive.copy().items():
-        # TODO: handle multipart
-        if message['In-Reply-To'] != parent: continue
-        archive.pop(message_id)
-        yield message, extract(archive, message_id)
-
-
-def decode(header):
-    for string, charset in decode_header(header):
-        encoding = 'utf-8' if charset is None else charset
-        yield string.decode(encoding)
-
-
-def render(template, forest, parent):
-    for self, children in forest:
-        message_id = self['Message-Id']
-        body = clean(linkify(markdown(self.get_payload())), tags=markdown_tags)
-        rendered_children = render(template, children, message_id)
-        author, address = decode(self['From'])
-        yield template.format(message_id=quote(message_id),
-                              date=self['Date'],
-                              author=author,
-                              parent=parent,
-                              subject=self['Subject'], body=body,
-                              children='\n'.join(rendered_children))
-
-
-parser = ArgumentParser()
-parser.add_argument('mbox')
-parser.add_argument('id')
-parser.add_argument('template', type=Path)
-args = parser.parse_args()
-
-archive = {m['Message-Id']: m for m in mbox(args.mbox)}
-template = args.template.read_text()
-print(*render(template, extract(archive, args.id), args.id), sep='', end='')