diff --git a/liberapay/models/participant.py b/liberapay/models/participant.py
index aae76c7f7..0a8b51c6a 100644
--- a/liberapay/models/participant.py
+++ b/liberapay/models/participant.py
@@ -1367,10 +1367,12 @@ def dequeue(msg, status):
         """)
 
     def set_email_lang(self, lang, cursor=None):
-        (cursor or self.db).run(
-            "UPDATE participants SET email_lang=%s WHERE id=%s",
-            (lang, self.id)
-        )
+        with self.db.get_cursor(cursor=cursor) as c:
+            c.run(
+                "UPDATE participants SET email_lang=%s WHERE id=%s",
+                (lang, self.id)
+            )
+            self.add_event(c, 'set_email_lang', lang)
         self.set_attributes(email_lang=lang)
 
 
diff --git a/liberapay/utils/emails.py b/liberapay/utils/emails.py
index 8df0e05ec..e113cd2d9 100644
--- a/liberapay/utils/emails.py
+++ b/liberapay/utils/emails.py
@@ -388,7 +388,9 @@ def test_email_server(ip_address: str, email=None, timeout=None) -> None:
                 # OpenSMTPD
                 msg.startswith("Invalid recipient: ") or
                 # Tutanota's SMTP server
-                msg.endswith("Recipient address rejected: Recipient not found")
+                msg.endswith("Recipient address rejected: Recipient not found") or
+                # Yandex
+                msg.startswith("No such user")
             )
             if recipient_rejected:
                 raise EmailAddressRejected(email, msg, ip_address)
diff --git a/www/%username/index.html.spt b/www/%username/index.html.spt
index db64d474b..23922986b 100644
--- a/www/%username/index.html.spt
+++ b/www/%username/index.html.spt
@@ -29,7 +29,7 @@ communities = () # participant.get_communities()
 langs = participant.get_statement_langs(include_conversions=True)
 
 patron_visibilities = participant.recipient_settings.patron_visibilities or 0
-if patron_visibilities > 1:
+if patron_visibilities & 4:
     public_patrons = website.db.all("""
         SELECT tipper_p.id
              , tipper_p.avatar_url
@@ -208,7 +208,7 @@ show_income = not participant.hide_receiving and participant.accepts_tips
         % endif
     % endif
 
-    % if patron_visibilities > 1 and n_public_patrons
+    % if n_public_patrons|default(0)
     <h3>{{ _("Patrons") }}
         &nbsp;
         <small><a href="{{ participant.path('patrons/public.csv') }}">{{ icon('download', _("Export as CSV")) }}</a></small>
diff --git a/www/robots.txt b/www/robots.txt
index 0b7bb4448..c19af86b8 100644
--- a/www/robots.txt
+++ b/www/robots.txt
@@ -3,4 +3,8 @@ Disallow: /log-in?back_to=*
 Disallow: /sign-in?back_to=*
 Disallow: /*.json
 Disallow: /*/income/
+Disallow: /*/widgets/*.js
 Disallow: /*?page=*
+Disallow: /*&page=*
+Disallow: /*?last_shown=*
+Disallow: /*&last_shown=*