Valid email domains added and tests passing.

app/templates/views/email-not-received.html

@@ -15,7 +15,7 @@
     <p>Check your email address is correct and then resend the confirmation code.</p>
 
     <form autocomplete="off" method="post">
-      {{ textbox(form.email_address, hint='Your email address must end in .gov.uk') }}
+      {{ textbox(form.email_address, hint='You must use an email address from a central government organisation', safe_error_message=True) }}
       {{ page_footer('Resend confirmation code') }}
     </form>
   </div>

app/templates/views/forgot-password.html

@@ -15,7 +15,7 @@ Create a new password – GOV.UK Notify
     <p>If you have forgotten your password, we can send you an email to create a new password.</p>
 
     <form autocomplete="off" method="post">
-      {{ textbox(form.email_address) }}
+      {{ textbox(form.email_address, safe_error_message=True) }}
       {{ page_footer("Send email") }}
     </form>
 

app/templates/views/invite-user.html

@@ -16,7 +16,7 @@ Manage users – GOV.UK Notify
   <div class="grid-row">
     <form method="post" class="column-three-quarters">
 
-      {{ textbox(form.email_address, hint='Email address must end in .gov.uk', width='1-1') }}
+      {{ textbox(form.email_address, hint='You must use an email address from a central government organisation', width='1-1', safe_error_message=True) }}
 
       <fieldset class='yes-no-wrapper'>
         <legend class='heading-small'>

app/templates/views/register.html

@@ -16,7 +16,7 @@ Create an account – GOV.UK Notify
 
     <form method="post" autocomplete="nope">
       {{ textbox(form.name, width='3-4') }}
-      {{ textbox(form.email_address, hint="Your email address must end in .gov.uk", width='3-4') }}
+      {{ textbox(form.email_address, hint="You must use an email address from a central government organisation", width='3-4', safe_error_message=True) }}
       {{ textbox(form.mobile_number, width='3-4') }}
       {{ textbox(form.password, hint="Your password must have at least 10 characters", width='3-4') }}
       {{ page_footer("Continue") }}

app/templates/views/user-profile/change.html

@@ -18,7 +18,7 @@ GOV.UK Notify | Service settings
     {% endif %}
     <div class="column-three-quarters">
       <form method="post">
-        {{ textbox(form_field) }}
+        {{ textbox(form_field, safe_error_message=True) }}
         {{ page_footer(
           'Save',
           back_link=url_for('.user_profile'),