c183957939
Added DEAD_ISP_DOMAINS (52 domains) to BLOCKED_EMAIL_DOMAINS, so every campaign builder that imports the shared exclusions (trucking, UCR, IFTA via create_and_schedule_campaign, and the healthcare importer) stops cold-mailing them. Domains were identified from our own Listmonk bounce table (top bounced recipient domains) cross-checked against ISP status: defunct dial-up brands (earthlink, netzero, juno, mindspring...), Qwest/Embarq legacy, satellite (hughes, wildblue, dishmail), Altice/Suddenlink rural, WOW!/Knology, small rural ISPs (windstream, tds, iowatelecom...) and Alaska regional. Deliberately keeps still-active large consumer ISPs (comcast/charter/cox/ centurylink) -- their bounces were the cold-IP/no-DKIM reputation problem (now fixed), not dead mailboxes, and they carry real prospects. Part of the email-deliverability incident hardening.
122 lines
6.3 KiB
Python
122 lines
6.3 KiB
Python
"""Shared recipient-domain exclusions for outbound cold-email campaigns.
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We self-host our MTA (transactional relays like SES forbid cold email), so we
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must protect our sending-IP reputation manually. The two biggest levers:
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1. NOT mailing the Yahoo/Verizon-Media family: those providers aggressively
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defer cold senders with "unexpected volume / user complaints" 421
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responses, which poisons the IP for every other provider too.
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2. NOT mailing Google CONSUMER mailboxes (gmail.com etc.) from a cold/warming
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IP: Google hard-rejects them with 550-5.7.1 "this message is likely
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unsolicited mail", and those rejections are reputation-damaging. (On
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2026-06-08 a warmup audit found gmail.com alone was 77% of our 550-5.7.1
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blocks -- 427 of 556.) Custom domains hosted on Google Workspace are a
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smaller, MX-only signal handled separately in the per-vertical builders.
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Keep this list authoritative and import it everywhere we build audiences.
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"""
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from __future__ import annotations
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# Yahoo / Verizon Media operates ALL of these consumer domains. Legacy AT&T and
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# Frontier consumer mail was handed off to Yahoo's infrastructure as well.
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YAHOO_FAMILY_DOMAINS: frozenset[str] = frozenset({
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# Yahoo / AOL core
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"yahoo.com", "yahoo.com.mx", "yahoo.es", "yahoo.it", "yahoo.ca",
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"myyahoo.com", "ymail.com", "rocketmail.com",
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"aol.com", "aol.com.mx", "aim.com", "love.com", "games.com", "wow.com",
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"netscape.net", "netscape.com", "cs.com", "compuserve.com",
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# AT&T family (Yahoo-hosted)
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"att.net", "sbcglobal.net", "bellsouth.net", "pacbell.net",
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"ameritech.net", "swbell.net", "snet.net", "flash.net", "prodigy.net",
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"wans.net", "nvbell.net",
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# Verizon family (Yahoo-hosted)
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"verizon.net", "verizongni.com", "bellatlantic.net",
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# Frontier (Yahoo-hosted)
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"frontier.com", "frontiernet.net",
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})
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# Google consumer mailboxes. Google's cold-IP spam filter (550-5.7.1) is the
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# strictest of the big providers; consumer gmail accounts have the highest
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# complaint sensitivity. We hold these out of cold/warmup sends. (This is the
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# domain-string layer; custom domains silently on Google Workspace need an MX
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# lookup and are handled in the per-vertical builders, e.g. the healthcare
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# mx_provider flag.)
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GOOGLE_CONSUMER_DOMAINS: frozenset[str] = frozenset({
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"gmail.com", "googlemail.com",
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})
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# Microsoft consumer mailboxes (Outlook.com / Hotmail). Microsoft's cold-IP
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# filtering (SmartScreen) tends to silently route cold B2B mail to Junk or
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# soft-defer rather than hard-bounce, so it is less visible than Google's
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# 550-5.7.1 but still a reputation drag (low engagement, spam-folder placement)
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# on a warming IP. These are consumer mailboxes, not real B2B carrier contacts,
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# so we hold them out of cold/warmup sends like the other consumer providers.
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MICROSOFT_CONSUMER_DOMAINS: frozenset[str] = frozenset({
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"hotmail.com", "outlook.com", "live.com", "msn.com", "hotmail.co.uk",
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"hotmail.fr", "live.co.uk", "outlook.es", "passport.com", "windowslive.com",
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})
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# Legal / complaint do-not-contact list. Addresses and domains here must NEVER
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# be cold-mailed or re-imported, independent of consumer-domain reputation
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# rules. Add a domain or a specific address when someone makes a formal
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# do-not-contact / opt-out demand we are honoring (e.g. a regulator complaint).
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# dataspindle.com / dave@dataspindle.com -- David Sgro, PA OAG complaint
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# BCP-26-05-025816; opted out 2026-04-13, permanently suppressed.
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DO_NOT_CONTACT_DOMAINS: frozenset[str] = frozenset({
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"dataspindle.com",
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})
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DO_NOT_CONTACT_EMAILS: frozenset[str] = frozenset({
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"dave@dataspindle.com",
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})
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# Defunct / legacy / satellite ISP mailbox domains. Cold-mailing these is pure
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# reputation drag: the mailboxes are overwhelmingly dead (the brand was shut down
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# or absorbed years ago and the addresses now hard-bounce) or the operator
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# (satellite / small rural ISP) aggressively defers cold B2B mail with poor
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# eventual delivery. Identified from our own Listmonk bounce table (top bounced
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# recipient domains) cross-checked against ISP status. NOTE: still-active large
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# consumer ISPs (comcast.net, charter.net, cox.net, centurylink.net) are
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# deliberately NOT here -- their bounces were the cold-IP/no-DKIM reputation
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# problem (now fixed), not dead mailboxes, and they carry real prospects.
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DEAD_ISP_DOMAINS: frozenset[str] = frozenset({
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# Defunct dial-up / early-ISP brands (mail shut down or vestigial)
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"earthlink.net", "peoplepc.com", "mindspring.com", "netzero.net",
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"netzero.com", "juno.com", "excite.com", "lycos.com", "wmconnect.com",
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"adelphia.net", "voyager.net", "core.com", "localnet.com", "pldi.net",
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"ptsi.net", "cablespeed.com",
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# CenturyLink / Qwest / Embarq legacy brands (migrated/abandoned)
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"qwest.net", "qwestoffice.net", "embarqmail.com", "centurytel.net",
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"citlink.net", "citynet.net",
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# Satellite (poor cold-mail deliverability, high defer/bounce)
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"hughes.net", "wildblue.net", "dishmail.net", "wildblueinternet.net",
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# Altice / Optimum / Suddenlink / Cablevision family (rural, aggressive defer)
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"optonline.net", "suddenlink.net", "cebridge.net", "bresnan.net",
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# WOW! / Knology, Mediacom, Insight, Atlantic Broadband/Breezeline, Cable One
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"wowway.com", "knology.net", "mchsi.com", "insightbb.com", "atlanticbb.net",
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"breezeline.net", "cableone.net", "cableone.com",
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# Small / rural regional ISPs (aggressive defer, low cold deliverability)
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"windstream.net", "tds.net", "iowatelecom.net", "netins.net", "mhtc.net",
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"arvig.net", "consolidated.net", "fuse.net", "ncn.net", "new.rr.com",
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# Alaska regional (satellite/long-haul, poor cold deliverability)
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"gci.net", "alaska.net", "acsalaska.net", "gulftel.com",
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})
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# The full set of consumer domains we refuse to cold-mail. Extend here as we
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# discover other reputation-sensitive providers.
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BLOCKED_EMAIL_DOMAINS: frozenset[str] = (
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YAHOO_FAMILY_DOMAINS | GOOGLE_CONSUMER_DOMAINS | MICROSOFT_CONSUMER_DOMAINS
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| DEAD_ISP_DOMAINS | DO_NOT_CONTACT_DOMAINS
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)
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def domain_of(email: str) -> str:
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"""Return the lowercased domain part of an email, or '' if malformed."""
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if "@" not in email:
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return ""
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return email.rsplit("@", 1)[-1].strip().lower()
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def is_blocked(email: str) -> bool:
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e = (email or "").strip().lower()
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return e in DO_NOT_CONTACT_EMAILS or domain_of(e) in BLOCKED_EMAIL_DOMAINS
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