US Internet Shuts Down Securence Email and DNS Hosting

US Internet (USI) has closed its Securence email services and switched off its authoritative DNS servers on 11 November 2026, as the Minnesota provider refocuses on fibre, voice and network services. Hosted mailboxes no longer accept new mail in either direction, residential addresses on USI domains such as @usinternet.com and @usiwireless.com have stopped working, and forwarding from those addresses to a new one ended on the same day.

For senders, the shutdown has two sides. Every address on a retired USI domain in your lists is now dead and will bounce. And any business that still relies on USI nameservers has lost more than its mailbox: when the authoritative DNS goes dark, the whole zone stops answering, including the MX, SPF, DKIM and DMARC records that other mail systems need.

What US Internet is shutting down

According to the Securence service retirement notice, two services end together. The first is Securence email: the hosted Exchange mailboxes and the residential mail service that USI customers have used on the provider's own domains. The second is USI's authoritative DNS hosting, which many small businesses used to publish the DNS records of their own domains.

USI is not moving any data for its customers. Mailboxes, shared mailboxes and distribution lists are not migrated automatically, so anything that was not exported before the cut-off depends on what USI still allows through its admin portal.

Businesses on their own domain

A business that used Securence with its own domain can keep its addresses. It needs a replacement mail host and must change its mail routing, that is, point the domain's MX records at the new provider. The same applies to addresses used as reply-to in campaigns: if the reply-to mailbox lived on Securence, replies to your newsletters bounce until the domain is routed elsewhere.

Domains that still use USI nameservers

This is the part most likely to be missed. A business that already moved its mailboxes but left its domain on USI nameservers loses its DNS on 11 November. Other mail systems can no longer find its mail host, because the MX lookup fails. The same failure hits every TXT record in the zone. Without a resolvable SPF record, DKIM public key and DMARC policy, mail sent from that domain through any ESP fails authentication at Gmail, Outlook.com and Yahoo, which all require it from bulk senders. See our guide to "No MX for domain" bounces for how these failures show up in logs.

Residential users

Personal addresses on USI domains, including @usinternet.com and @usiwireless.com, stop working, and the forwarding service that could have bridged the move ends at the same time. The retirement page lists every affected residential domain. Those subscribers now receive mail at a new address, if they have set one up, and the old address in your database is unreachable.

Action checklist

• Search your lists for the USI domains named on the retirement page, starting with usinternet.com and usiwireless.com, and count how many active contacts you hold there.
• Suppress them after the first hard bounce rather than retrying. Our guide to hard and soft bounces explains which codes to treat as permanent.
• Ask for a new address before the contact goes silent: a short re-permission email to any USI subscriber who has not bounced yet, or a preference-centre prompt.
• Check your reply-to and From domains if your business used Securence: confirm the MX now points to your new mail host.
• Move DNS off USI nameservers and republish MX, SPF, DKIM and DMARC at the new DNS host, then test that each record resolves. Our MX records guide covers the checks.
• Audit client domains if you are an agency: list every sending domain whose NS records point to USI.

A pattern of retired ISP mail

USI is one more regional provider leaving the mail business. Each time, a block of addresses turns into hard bounces overnight, and small businesses find their DNS lived with the provider too. Our list of old email domains that still work or are dead tracks these retirements.

Sources

1. Securence: service retirement notice and migration instructions (primary source)
2. Securence admin portal

Related on SMTPedia

• Old email domains: which still work and which are dead
• No MX records email bounces: causes and fixes
• Hard bounce vs soft bounce: SMTP codes and fixes