Email domain profile

Is comcast.net a valid email address?

Is comcast.net a valid email address? Yes. comcast.net is the email domain of Comcast’s Xfinity customers. Xfinity is moving active Comcast.net mailboxes to Yahoo Mail in 2025 and 2026; the addresses stay the same.

Updated October 10, 2026 · 2 min read

Short answer

Yes. comcast.net is a real, active email domain: Xfinity’s help calls these “Comcast.net email” addresses, and on October 10, 2026 the domain’s MX records still pointed to Comcast’s own mail hosts. Xfinity is moving active accounts to Yahoo Mail in batches during 2025 and 2026. Users then sign in at Yahoo with the same @comcast.net address.

comcast.net at a glance

Status
Active, migration to Yahoo Mail in 2025 and 2026
Run by
Comcast, under its Xfinity brand
Mail service
Xfinity email, moving to Yahoo Mail · server settings
New addresses
Not documentedNeither Xfinity’s nor Yahoo’s pages say whether new comcast.net addresses are created
Unused mailboxes
Only accounts signed in to within the past two years move to Yahoo Mail
MX hosts
  • 5mx1.mxge.comcast.net
  • 5mx2.mxge.comcast.net
  • 50mx1a1.comcast.net
  • 50mx1c1.comcast.net
  • 50mx1h1.comcast.net
  • 50mx2a1.comcast.net
  • 50mx2c1.comcast.net
  • 50mx2h1.comcast.net

Run a live MX lookup

SPF record
v=spf1 ip4:96.103.146.48/28 ip4:96.102.19.32/28 ip4:96.102.200.0/28 include:_spfv6.comcast.net include:_spf.mdp.comcast.net include:_ipspf.yahoo.com ~allCheck the live SPF record
DMARC policy
p=reject; sp=rejectCheck the live DMARC record
DNS records checked
MX, SPF and DMARC records observed October 10, 2026 with DNS-over-HTTPS (dns.google).
Our free-provider list
Listed · free email domains list
Our disposable list
Not listed · disposable email domains list
Domain registered
September 25, 1997First registration in the registry’s RDAP record, not the start of the email service.

Who runs comcast.net

Comcast, under its Xfinity brand, and increasingly Yahoo. Xfinity’s help pages call the accounts “Comcast.net email”, and the Xfinity mail-client settings still describe Comcast’s own servers. On October 10, 2026, DNS for comcast.net listed eight MX hosts, all Comcast’s: mx1.mxge.comcast.net and mx2.mxge.comcast.net with priority 5, and six backups with priority 50.

That is changing. Yahoo’s help article Information for Xfinity Comcast.net email accounts moving to Yahoo Mail says Xfinity will move Comcast.net email accounts to Yahoo Mail at different times in 2025 and 2026:

DNS already reflects the move in one place: the comcast.net SPF record includes Yahoo’s _ipspf.yahoo.com next to Comcast’s own ranges, so Yahoo’s servers may send mail for the domain. Expect the MX records to change as the move goes on; the MX lookup shows the current state.

Can you still create a comcast.net address?

Not documented. Neither Xfinity’s current help pages nor Yahoo’s migration article says whether new comcast.net addresses are still being created, so we leave that open. What Yahoo’s article does say: the addresses belong to current and former Xfinity customers.

Is comcast.net a valid email address for your list?

Yes. Things to keep in mind:

Users who still read their mail on Comcast’s servers need the Comcast IMAP settings; after the move, Yahoo’s settings apply.

Sources

Check an address at comcast.net

A real domain doesn’t mean the mailbox exists. The email checker looks up the domain’s MX records and asks the mail server about the mailbox without sending an email, and it flags disposable, role and free-provider addresses.

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Frequently asked questions

Is comcast.net a valid email address?

Yes. comcast.net is the email domain of Xfinity (Comcast) customers and has working MX records. Whether one particular address still has a mailbox is something only a check of the full address shows.

Is Comcast email moving to Yahoo?

Yes. Yahoo’s help says Xfinity will move Comcast.net email accounts to Yahoo Mail at different times in 2025 and 2026. Users sign in at Yahoo with their full Comcast.net address afterwards.

Will comcast.net addresses keep working after the move?

Active ones do: after the move, users sign in to Yahoo Mail with the same @comcast.net address. Yahoo defines an active account as one signed in to within the past two years; others aren’t part of the move.

Are Comcast and Xfinity email the same?

Yes. Xfinity’s help calls its email accounts “Comcast.net email”, and the addresses end in @comcast.net. See the Comcast IMAP settings for mail apps.

Related domains and settings

Comcast email settingsComcast IMAP settings: imap.comcast.net, port 993, SSL. Xfinity SMTP is smtp.comcast.net on 587 or 465. How to allow third-party access, iPhone setup, fixes. verizon.netOld Verizon domain at AOL Mail, closed to new sign-ups. Operator, MX hosts and list flags. ymail.comYahoo Mail domain, closed to new sign-ups. Operator, MX hosts and list flags.

Email validation API

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/v1/info Email validation API Read the documentation

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GET https://api.emailvalidation.io/v1/info?email=support@emailvalidation.io

{
  "email": "support@emailvalidation.io",
  "user": "support",
  "tag": "",
  "domain": "emailvalidation.io",
  "format_valid": true,
  "mx_found": true,
  "smtp_check": true,
  "catch_all": null,
  "role": true,
  "disposable": false,
  "free": false,
  "score": 0.64,
  "state": "deliverable",
  "reason": "valid_mailbox",
  "did_you_mean": ""
}

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