6f361d307d
Main-pool delivery was stuck ~60-67% (897+ daily spam-blocks). Audit of the main listmonk found ~47k consumer mailboxes still enabled in OLD cold trucking lists (built before the exclusion existed): 19k gmail, 27.5k yahoo-family + Microsoft consumer. gmail alone was 101 of today's 909 550-5.7.1 blocks. Blocklisted all ~47k consumer addresses NOT in the protected FCC lists 3/6 (per the keep-gmails decision for those warm lists). Also added Microsoft consumer domains to BLOCKED_EMAIL_DOMAINS so the daily trucking builder stops re-adding them (Microsoft SmartScreen silently junks/defers cold B2B mail -- a reputation drag even though it doesn't 550 like Google). Enabled base 95455 -> 48707 (real business/ISP domains).
75 lines
3.5 KiB
Python
75 lines
3.5 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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# 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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)
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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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return domain_of(email) in BLOCKED_EMAIL_DOMAINS
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