Use email instead of team name in "<user> invites you to their account" emails. Unfortunately the team name is being abused for spam.

templates/emails/login-body-html.html

@@ -6,7 +6,7 @@ Hello,
 <br />
 
 {% if inviting_profile %}
-    <strong>{{ inviting_profile }}</strong> invites you to their
+    <strong>{{ inviting_profile.user.email }}</strong> invites you to their
     <a href="{% site_root %}">{% site_name %}</a> account.
     <br /><br />
 

templates/emails/login-body-text.html

@@ -1,7 +1,7 @@
 {% load hc_extras %}
 {% block content %}Hello,
 {% if inviting_profile %}
-{{ inviting_profile }} invites you to their {% site_name %} account.
+{{ inviting_profile.user.email }} invites you to their {% site_name %} account.
 
 You will be able to manage their existing monitoring checks and set up new
 ones. If you already have your own account on {% site_name %}, you will