Comcast is shutting down its email service, and Xfinity customers must act to keep it

Comcast has begun permanently retiring the independent email system behind every comcast.net address, moving accounts onto Yahoo Mail’s platform in a rollout that started in June 2025 and continues in stages through 2026. Xfinity customers who ignore the transition notice risk losing years of stored messages, folders and contacts once their individual migration window closes.

The move affects any comcast.net mailbox that has been signed into within the past two years, whether the owner still pays Xfinity for internet or television service or canceled that service years ago, because Comcast never tied the free email account to its other subscriptions.

The sign-in Xfinity requires before the mailbox moves

Once an account is chosen for migration, Xfinity delivers a notice inside the inbox telling the customer to sign in at connect.xfinity.com, review the terms Yahoo now sets for the account, and press “Continue” to complete the handoff. The notice specifies that a person keeps the comcast.net address itself, along with stored messages, folders and contacts, but that all of that content is removed from Xfinity’s own servers the moment it lands in Yahoo’s system. It also states plainly that the migration has no effect on any paid Xfinity or Comcast service the household still holds, separating the free mailbox entirely from the cable or internet bill.

Xfinity’s own migration overview page describes the same window: eligibility runs to any comcast.net account accessed within the past two years, including addresses tied to accounts closed long ago, and the rollout that began in June 2025 is still working through the remaining inboxes into 2026. The same page warns that email settings, filters and forwarding rules do not carry over automatically, so anyone using Outlook, Apple Mail or another third-party app has to reconfigure those tools with Yahoo’s server settings after the switch rather than before it.

The data limits erasing old attachments and folders

Not everything survives the jump intact. Yahoo’s own migration help page caps a single message at 25 megabytes, caps folders at 4,100 with any excess merged into one catch-all folder, and caps contacts at 10,000 entries pulled only from the address book rather than any “collected addresses” list Xfinity built automatically over the years. Yahoo tells anyone with a large archive to “download and delete any emails over 25MB” before the transfer runs, since oversized attachments do not make the trip. Folder names longer than 240 characters get truncated as well, a limit that catches years-old folders named after long-dead projects or events.

The limits do not apply retroactively once migration completes. They only matter in the narrow window before an account moves, which is why Yahoo frames the cleanup as something to finish beforehand rather than fix afterward. Anyone unwilling to hand a decades-old mailbox to Yahoo at all can instead export its contents and close the account outright through export.xfinity.com, the alternative Yahoo’s own help page lists for customers who would rather walk away than accept the new terms.

Comcast’s own warning about fake migration messages

The migration also created an opening for fraud, and Xfinity has published its own safety guide to counter it. A genuine migration message arrives only from the address [email protected] and carries a verified Xfinity logo when opened through webmail; anything else claiming to be the migration notice is fake. Xfinity specifically warns customers to distrust messages that pressure them to “verify immediately or lose access,” calling that language a hallmark of the copycat emails now circulating alongside the real rollout. Other red flags include a sender address that does not match the official one and any link that leads somewhere other than connect.xfinity.com, both signs worth checking before typing a password anywhere.

Xfinity also says it will never ask a customer to reply to an email with a password or other sensitive information, and that the only safe way to complete the move is signing in directly at connect.xfinity.com rather than clicking a link inside any message, official-looking or not.

The accounts Comcast will close instead of migrate

Not every account gets migrated. According to a report from Cord Cutters News published May 18, 2026, Comcast began flagging comcast.net mailboxes that had gone untouched for 24 months or longer starting in January 2025, restricting their access after 30 days without a response and permanently deleting the account and everything inside it once a 90-day grace period runs out. That closure track runs separately from the Yahoo migration and cannot be reversed once the grace period ends, unlike a simple missed sign-in on an account still in active use.

For accounts still active, the practical test is the one Xfinity and Yahoo both describe: sign in once, accept the new terms, and confirm the inbox, contacts and folder structure built up over years actually reappear on the other side of the switch, before the two-year eligibility window makes that check unnecessary.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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