docuseal/app/views/user_mailer/invitation_email.html.erb

<p>Hello <%= @user.first_name %>,</p>
<p>You have been invited to <%= @user.account.name %> <%= Docuseal.product_name %>. Please sign up using the link below:</p>
<p><%= link_to 'Sign up', invitation_url(reset_password_token: @token) %></p>
<p>Please contact us by replying to this email if you didn't request this.</p>
<p>
  Thanks,<br><%= @current_account.name %>
</p>