billing: Use no-reply address as from_address in sponsorship emails.

corporate/tests/test_stripe.py

@@ -1092,7 +1092,8 @@ class StripeTest(StripeTestCase):
             self.assertEqual(len(message.to), 1)
             self.assertEqual(message.to[0], "desdemona+admin@zulip.com")
             self.assertEqual(message.subject, "Sponsorship request (Open-source) for zulip")
-            self.assertEqual(message.from_email, f'{user.full_name} <{user.delivery_email}>')
+            self.assertEqual(message.reply_to, ['hamlet@zulip.com'])
+            self.assertIn('Zulip sponsorship <noreply-', message.from_email)
             self.assertIn("User role: Member", message.body)
             self.assertIn("Support URL: http://zulip.testserver/activity/support?q=zulip", message.body)
             self.assertIn("Website: https://infinispan.org", message.body)

corporate/views.py

@@ -217,8 +217,9 @@ def sponsorship(request: HttpRequest, user: UserProfile,
     send_email(
         "zerver/emails/sponsorship_request",
         to_emails=[FromAddress.SUPPORT],
-        from_name=user.full_name,
-        from_address=user.delivery_email,
+        from_name="Zulip sponsorship",
+        from_address=FromAddress.tokenized_no_reply_address(),
+        reply_to_email=user.delivery_email,
         context=context,
     )