Updated Reference: Altice USA, Suddenlink, Optonline, Cablevision (Synchronoss) Email Domains

Cablevision, Optonline, and Suddenlink
cable internet services all seem to be owned by Altice USA, a company spun out from the European telecommunications provider Altice.

Altice USA is a collection of brands brought together via multiple acquisitions, and Altice USA has outsourced email service for these domains to a company called Synchronoss. Alas, I wasn't able to find any email postmaster/deliverability-specific contact information for Synchronoss, but with this list of domains you could at least easily configure and adjust throughput and throttle settings as necessary.

Cablevision, Optonline, and Suddenlink Email Domains include: aamasonryinc.com, abcts.com, alphalabsusa.com, anatolelubbock.com, apexsurvey.com, bmsnr.com, brannonoil.com, brantoncompany.com, caddost.com, calvaryandrews.com, candcmachinery.com, carlbrowncpa.com, carolinacourtreporters.com, cebridge.net, chamber.huntsville.tx.us, cityofwinfieldtx.com, classicnet.net, cobbholmanlumber.com, edhauto.com, gatewaysnyder.com, gibraltarenergy.com, halfmannrealty.com, harrellfinancialservices.com, heritagehomessnyder.com, highagency.com, hoodtoolingandmachine.com, jacksonmelons.com, jayadkins.com, johnmclarkinc.com, kccrop.com, kiffe.com, kingwoodcable.com, kingwoodcable.net, npgcable.com, optimum.net, optonline.com, optonline.net, ponyexpress.net, stfrancis-wv.org, stjoelive.com, suddenlink.net, suddenlinkmail.com, tyler.net, uneedspeed.net.

Note that this list may include the domains of some customers of Altice USA. All MX records (at the time this was published) point to "mx-cust.mx-altice.prod.cloud.synchronoss.net" indicating some connection to Altice USA.

Altice USA has a number of corporate domains. The mail for all of these corporate domains are hosted by Microsoft. These corporate domains include: alticetechservicesusa.com, a4media.com, cablevision.com, alticeusa.com, optimum.com, suddenlink.com.

Got any updates? Comment below or drop me a line, and thanks!

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