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

<p>Hello <%= @user.first_name %>,</p>
<p>You have been invited to Docuseal. You can sign up this through the link below.</p>
<p><%= link_to 'Set my password', invitation_url(reset_password_token: @token) %></p>
<p>If you didn't request this, please ignore this email.</p>