ispdomains

Lumen Technologies, aka CenturyLink, absorbed Embarq, combined with Qwest, which acquired USWest (if you’ve really been around a while) and is a telecommunications provider come together from many parts, with bits of them descended all the way from Mountain Bell, Pacific Northwest Bell and Northwestern Bell, the latter being the predecessor company that ran the copper wires that eventually delivered DSL internet service to my Minneapolis apartment starting near the turn of the millennium. Fast forward to today, and they continue to provide consumer internet access in various locales across the USA, and that includes hosting consumer email services for those users across a number of domains. Those domains include:digisys.netcswnet.commebtel.netcenturylink.netq.comembarqmail.comgrics.netcenturytel.netqwest.netcoastalnow.netgulftel.comThe MX for these domains points at mx.centurylink.net, but if you connect on port 25 and read the SMTP banner, you’ll see “cloudfilter.net” which is actually Cloudmark. Thus, if you’re having spam-related deliverability troubles at CenturyLink, you’ve probably got a Cloudmark

Australian internet service provider (ISP) and telecoms provider iiNet Limited (aka TPG, Internode and Westnet) is getting out of the email business.Instead of an outright shutdown, the core iiNet email services are being transitioned to “The Messaging Company” and after a possible period of free service (through September 15, 2024?), users will have to pay to maintain that email service.Multiple sources report that users are upset; for among other reasons, email aliases will not be transferred to the new email service and will be lost.Senders, you’re likely to see an increase in bounces at the iiNet domains as users abandon ship; surely not all of them will pay to transition to the new service, and even for those that do, they may lose some email aliases. You might want to reach out to iiNet users as soon as possible and offer them the ability to register an alternate email address.Should you

Proton (previously known as ProtonMail) is a “privacy and digital freedom” focused company based in Switzerland whose main offering is Proton Mail, offering end-to-end encryption, the promise of Swiss data security laws applying to oversight of your data, features to protect users from sender tracking, and more.If you’re looking to special case how you send mail to Proton’s subscriber base, for purposes of list segmentation, MTA throughput settings, or something similar, you’ll need to know all of Proton’s email domains.Their primary email domains are:proton.meprotonmail.compm.meprotonmail.ch The also host mail for various custom domains. Of the top 10 million domains, they host mail for just over six thousand email domains. To find those, look for domains that have an MX record pointing to “mail.protonmail.ch” or “mailsec.protonmail.ch.”

Australian telecommunications provider Telstra has long provided internet services (including email), initially via the “Bigpond” brand (launched in 1996, later retired). They’re reported to have 18.8 million customer accounts, though I don’t know how many active email accounts that translates to. Even if you assume a 1:1 correlation between user accounts and email accounts (which is unlikely), that’s still quite a bit smaller than, say, Yahoo Mail (which was reported as having 225 million active users as of 2017). Regardless, a multi-million subscriber base is nothing to sneeze at.I don’t have much information on blocking/unblocking information for senders with Telstra/Bigpond delivery issues at this time. I’ll add information here as I’m able to.In the mean time, if you are having a Telstra/Bigpond-related deliverability issue, and if you would like to segment out or suppress mail to the Telstra domains, here’s a list of their primary email domains:telstra.comtelstra.com.aubigpond.combigpond.com.auTelstra hosts email for

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

Wondering what domain names mailbox provider Fastmail uses for their email service? You’ll never get an exact list, as customers can point their own domains at the service, but it turns out that Fastmail has a built-in list of 110 email domains that they offer up for client use.As of October 2022, those 110 domains are:123mail.org, 150mail.com, 150ml.com, 16mail.com, 2-mail.com, 4email.net, 50mail.com, airpost.net, allmail.net, cluemail.com, elitemail.org, emailcorner.net, emailengine.net, emailengine.org, emailgroups.net, emailplus.org, emailuser.net, eml.cc, f-m.fm, fast-email.com, fast-mail.org, fastem.com, fastemailer.com, fastest.cc, fastimap.com, fastmail.cn, fastmail.co.uk, fastmail.com, fastmail.com.au, fastmail.de, fastmail.es, fastmail.fm, fastmail.fr, fastmail.im, fastmail.in, fastmail.jp, fastmail.mx, fastmail.net, fastmail.nl, fastmail.org, fastmail.se, fastmail.to, fastmail.tw, fastmail.uk, fastmailbox.net, fastmessaging.com, fea.st, fmail.co.uk, fmailbox.com, fmgirl.com, fmguy.com, ftml.net, hailmail.net, imap-mail.com, imap.cc, imapmail.org, inoutbox.com, internet-e-mail.com, internet-mail.org, internetemails.net, internetmailing.net, jetemail.net, justemail.net, letterboxes.org, mail-central.com, mail-page.com, mailas.com, mailbolt.com, mailc.net, mailcan.com, mailforce.net, mailhaven.com, mailingaddress.org, mailite.com, mailmight.com, mailnew.com, mailsent.net, mailservice.ms, mailup.net, mailworks.org, ml1.net, mm.st, myfastmail.com, mymacmail.com, nospammail.net, ownmail.net, petml.com, postinbox.com, postpro.net, proinbox.com, promessage.com, realemail.net, reallyfast.biz, reallyfast.info, rushpost.com

Estonian webhost and mailbox provider Zone now supports BIMI and will display a sender logo in Zone Webmail, if they’re able to. VMC is required. Find more details here.Doing a quick check of my domain data, I think that Zone’s primary email domains are:webmail.zone.eezone.com.eezone.eezone.euzone.fizone.ltzone.lvThey also host email for more than a thousand other domains for customers; all relevant domains have an MX record pointing to zonemx.eu.

It’s been a long road, getting from there to here. Once wholly separate companies, Time Warner Cable, Bighthouse Networks (and a piece of long-bankrupt Adelphia Cable) are all now part of Charter Communications, and all lately branded as “Spectrum.”Deliverability guidance for the realm of Spectrum is sparse. They don’t publish a postmaster site and don’t seem to respond for requests for help. Per my prior investigation and information from Validity, they do use Cloudmark, and it’s possible to review bounce messages and/or identify Cloudmark fingerprinting in an attempt to troubleshoot delivery issues; but I wouldn’t count on being able to successfully request unblocking from somebody at Spectrum.What I can do is offer you this updated list of Spectrum email domains, so that it might help you segment and target if/when you are needing to clean up any list hygiene issues to improve deliverability to Spectrum.Here’s the most current list of

Hey! I know that people find the ISP domain guides useful, so I thought I’d fire up the blog machine to share info about our friends at American telecommunications company Comcast (Xfinity) and their various email domains. I’m not sure that everybody knows this information already, so I though it would be good to share.It’s mostly pretty simple, and it boils down to this:comcast.net: People who have cable internet service from Comcast (aka Xfinity) and who use Comcast’s email service are going to have their mailboxes in this domain name.comcast.com: Comcast employees are going to have their mailboxes in this domain.cable.comcast.com: Comcast employees will be found here, too.xfinity.com: does have an MX record and you might think it’s alive for email, but I’m not seeing any widespread evidence that any significant number of mailboxes are hosted here.If you run some sort of website where people signup for email messages from…

(You might notice that this is a slightly-modified repost of previous content. It was necessary to deal with Blogger suddenly taking issue with a post containing a giant list of domains. Whoops.)Looking to segment your email database based on ISP? Want to break out separate content or timing for Yahoo Mail versus Microsoft OLC versus Gmail subscribers? I’ve got you covered. Click here to download the full “MAGY” (Microsoft, AOL, Gmail, Yahoo) domain list, and feel free to use it for email segmentation. (And please don’t use it for spammy purposes.)