I asked ACOM about the email support addresses missing from the "Contact Us" page. Their reply was:
Thank you for contacting Ancestry.com regarding email inquiries to Ancestry.com.
We do still have email support, however we have taken away the link to email us from the website. We would prefer that you call in. Many times this makes the issue much simpler to resolve as we can help you directly. If you would like to continue emailing in your questions you can send them into firstname.lastname@example.org
If you need additional assistance, please feel free to reply to this message or contact us by phone at 1-800-ANCESTRY (1-800-262-3787) from 10am to 10pm EST, Monday through Sunday.
Customer Solutions Associate