/usr/bin/um-url is in unity-mail 0.92.2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49  | #!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Unity Mail, QuickList URL processor
# Author: Dmitry Shachnev <mitya57@gmail.com>
# License: GNU GPL 3 or higher; http://www.gnu.org/licenses/gpl.html
import os.path
import sys
import webbrowser
from configparser import RawConfigParser
from subprocess import Popen
CONFIG_DIR = os.path.expanduser('~/.config/')
if not os.path.exists(CONFIG_DIR+'autostart/unity-mail-autostart.desktop'):
	# First run of Unity Mail, open um-config
	Popen('um-config')
	sys.exit()
parser = RawConfigParser()
parser.read(CONFIG_DIR+'unity-mail.conf')
default = \
{  'Home': 'https://mail.google.com/mail/',
'Compose': 'https://mail.google.com/mail/#compose',
  'Inbox': 'https://mail.google.com/mail/#inbox',
   'Sent': 'https://mail.google.com/mail/#sent' }
def print_names():
	print('Possible URL names: "Home", "Compose", "Inbox", "Sent"')
if len(sys.argv) > 1:
	name = sys.argv[1]
	if parser.has_option('URLs', name):
		url = parser.get('URLs', name)
		if url.startswith('Exec:'):
			Popen(url[5:].split(' '))
		else:
			webbrowser.open(url)
	else:
		try:
			webbrowser.open(default[name])
		except KeyError:
			print('Error: unknown URL name!')
			print_names()
else:
	print('Error: please specify URL name.')
	print_names()
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