mastodon/app/views/user_mailer/email_changed.text.erb

<%= t 'devise.mailer.email_changed.title' %>

===

<%= t 'devise.mailer.email_changed.explanation' %>

<%= @resource.try(:unconfirmed_email) ? @resource.unconfirmed_email : @resource.email %>

<%= t 'devise.mailer.email_changed.extra' %>