TDC.dk consumer email is one of those services that people keep configuring in their mail clients years after it stopped working. TDC (Denmark’s incumbent telecom) offered @tdc.dk and @mail.dk consumer mailboxes for decades on the Intermail platform, but Intermail itself was discontinued long ago, mail.dk was shut down, and TDC Group split in 2019 into TDC NET (network infrastructure) and Nuuday (consumer brands like YouSee). Today tdc.dk is a corporate domain only. If you cannot get your TDC email settings to work, that is why. This guide covers what actually happened, and how to migrate to a service that still exists.
TDC and mail.dk email is discontinued: no working settings for the old addresses
Service shutdown: consumer email retired during the 2019 TDC Group split. TDC Group split into TDC NET (network infrastructure) and Nuuday (consumer services) in 2019, and the consumer mail platform (originally on the Openwave Intermail system) was retired at the same time. Standalone @tdc.dk and @mail.dk addresses were not preserved through the split, they no longer authenticate against any mail server and no SMTP, IMAP, or POP3 configuration will connect. YouSee, Nuuday’s dominant consumer broadband brand, provisions new @mail.yousee.dk mailboxes for broadband subscribers, but these are new accounts, not a continuation of @tdc.dk. The migration options below are the only path forward.
What happened to TDC.dk and mail.dk email
TDC (originally Tele Danmark Communications) was Denmark’s incumbent telecom operator and, for most of the 2000s, one of the country’s default consumer email providers. Personal mailboxes were offered at @tdc.dk and, more commonly for households, @mail.dk. Both ran on Intermail, a hosted messaging platform from Openwave that many European incumbents used before Google and Microsoft ate the market.
Two things ended it. First, Openwave discontinued the Intermail product, taking down the platform that TDC mail.dk sat on top of. Users started seeing intermittent bounces and connection failures, and TDC did not migrate the service to a modern replacement in a way that kept customers stable. Second, in September 2019 TDC Group split into two independent companies: TDC NET, which took the physical fiber and mobile network infrastructure, and Nuuday, which took the consumer-facing brands including YouSee, Blockbuster, and various business brands.
Post-split, tdc.dk became a corporate-facing domain for the network side. There is no consumer email tied to it. The former mail.dk mailboxes are effectively gone from an active-service perspective. If you have not migrated by 2026, the account is not sitting there waiting for you.
Option 1: Migrate to YouSee (if your subscription is via Nuuday)
YouSee is the primary Nuuday consumer brand covering broadband, TV, and mobile in Denmark. It is the natural successor for former TDC household customers. YouSee has offered a consumer email service under @youmail.dk historically, though the service has evolved significantly over time.
1. Check your active subscription
If you receive broadband or TV service from YouSee, sign in to the YouSee customer area at yousee.dk with the credentials tied to your subscription. Email service availability depends on your plan.
2. Verify email is included in your plan
Not every YouSee plan bundles email in 2026. If email is available, activation is done from the customer area. If not, treat YouSee as an internet-only provider and go with Gmail or Outlook.
Realistic assessment: even where YouSee still offers email, it is a legacy service. The strategic direction across Nuuday brands has been to encourage customers onto standard providers rather than maintain ISP email long-term. If you have to choose, Gmail or Outlook is safer for a five-year horizon.
Option 2: Migrate to Gmail
Gmail is the most common landing spot for former Danish ISP email customers. The address is provider-independent and stays yours whether you change internet provider or move country.
1. Create a Gmail account
Go to gmail.com and set up a fresh account. Choose an address you can live with for the long term.
2. Attempt to import from mail.dk if it still authenticates
In Gmail, Settings then Accounts and Import then Import mail and contacts. If any mail.dk credentials still authenticate somewhere, this pulls existing messages. In most 2026 cases this will fail because the service is gone, but it is worth trying.
3. Set up forwarding on the old account if possible
Same idea: if you can still sign in anywhere, enable forwarding to Gmail. Realistically for TDC consumer accounts, this option is no longer available.
4. Send a change-of-address notification
The bigger fix is a mass email from your new Gmail letting contacts know your address changed. Include the old @tdc.dk or @mail.dk so recipients can search and update their address books.
If you have not migrated already, focus on the new address: Danish TDC consumer email has been in decline for so long that most users have already moved. The remaining question is not “how do I keep tdc.dk working” but “how do I make sure my contacts know my new address.” Prioritize that.
Option 3: Migrate to Outlook.com
Microsoft’s outlook.com works the same as Gmail. Settings then Sync email then Other email accounts handles imports. The main reason to prefer Outlook.com over Gmail is if you already use OneDrive, Office online, or a Microsoft 365 subscription.
Alternatives at a glance
Common issues with legacy TDC email
Mail client returns 421 or connection failed on mail.dk servers
The historical mail.dk mail servers (running on the Intermail platform) no longer exist. Any client still configured for mail.dk hostnames will fail. There is no equivalent set of “correct” settings to substitute; the service itself is gone.
tdc.dk webmail login page 404s or redirects
tdc.dk is now a corporate domain. No consumer webmail interface is hosted there. If a bookmark used to lead to a login page, that page has been removed.
Old @tdc.dk address still receives an occasional message
Some legacy routing may briefly persist in unusual cases, but treat this as unreliable. Do not build any workflow around it. Notify contacts of your new address and move on.
Cannot recover old mail.dk messages
If the mailbox was on the Intermail platform and that platform was shut down without a preserved export, the messages are not recoverable. This is a real loss for many former customers; the practical action is accepting it and building forward from a modern provider.
YouSee webmail available or not?
YouSee mail availability depends on the specific plan. In many cases new subscriptions do not include email at all. Verify from the YouSee customer area before assuming it will work as a TDC successor.
Frequently asked questions
Can I still use my old @tdc.dk or @mail.dk address?
Not as an actively hosted consumer mailbox. The service ran on the Intermail platform, which Openwave discontinued, and TDC’s successor entities (TDC NET and Nuuday) did not maintain it. In 2026 there is no active TDC consumer mail server to authenticate against.
What are the correct TDC or mail.dk SMTP settings?
There are no current working values because the service is discontinued. Any settings you find online for mail.dk or tdc.dk consumer accounts refer to the retired Intermail platform. Configure your mail client for Gmail, Outlook, or your current ISP’s mail service instead.
What is Nuuday and what is TDC NET?
The 2019 TDC Group split produced two independent companies. TDC NET owns and operates the physical infrastructure (fiber, mobile network). Nuuday owns the consumer-facing brands: YouSee, Blockbuster, Hiper, and several business brands. Consumer questions go to whichever Nuuday brand your subscription is under.
Can I export old mail.dk messages before losing them?
Only if the mailbox is still authenticating somewhere, which is unlikely by 2026. If you did save mail locally in Thunderbird or Outlook before the shutdown, that local archive is your only copy. If you did not, the messages are effectively lost.
Does YouSee still offer email?
Availability depends on the plan and has changed over time. Some YouSee subscribers still have access to a legacy mailbox; new subscriptions typically do not include email. Check the customer area at yousee.dk to confirm before treating it as a TDC replacement.
What should I use instead?
Gmail or Outlook.com for the vast majority of former TDC consumers. Both are free, both survive changes in internet provider, and both have modern deliverability and spam handling. Pick one and move on.
Where to go next
TDC.dk email is one of several Nordic incumbent-ISP consumer mail services that quietly ended over the past decade. If you are dealing with a similar migration from another legacy provider, the same three-option framework applies.
- NetCom.no to Telia Norge migration guide
- Gmail POP3, IMAP, and SMTP settings
- Outlook.com POP3, IMAP, and SMTP settings
Historical timeline of TDC consumer email
- 2019 to present: tdc.dk exists as a corporate domain for the TDC NET side of the split. No consumer webmail is hosted at the domain.
- September 2019: TDC Group formally split into TDC NET (network infrastructure) and Nuuday (consumer and business brands including YouSee, Blockbuster, and Hiper).
- Mid-2010s: Openwave discontinued the Intermail messaging product; the mail.dk platform became unstable and TDC did not migrate to a modern replacement.
- 2000s: TDC consumer email peaks. @tdc.dk and @mail.dk are among the most common Danish email addresses, tied to TDC’s dominant home broadband position.
- Earlier: Tele Danmark Communications provides email as a bundled service with its dial-up and later broadband subscriptions.
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About the Author
Alaa · LinkedIn
Email infrastructure specialist with 8+ years of hands-on experience in SMTP, deliverability, and email verification. I’ve configured and troubleshot mail systems across Postfix, Exchange, and cloud relays, managed IP reputation and warmup campaigns, and built verification pipelines processing millions of addresses. My work spans DNS authentication (SPF, DKIM, DMARC, BIMI), bounce handling, blocklist monitoring, and compliance frameworks including CAN-SPAM and GDPR. I write every article on SMTPedia to give email professionals, developers, and marketers the accurate, RFC-grounded reference they need.
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