b973c6c132
Warmup audit (2026-06-08) found the main sending pool was eating a 37% bounce rate, and 556 of those were Google 550-5.7.1 'likely unsolicited mail' spam blocks -- of which gmail.com alone was 427 (77%). Google's cold-IP filter is the strictest of the big providers and consumer gmail has the highest complaint sensitivity, so mailing it from a warming IP is pure reputation damage. Added GOOGLE_CONSUMER_DOMAINS (gmail.com, googlemail.com) to BLOCKED_EMAIL_DOMAINS, which the daily trucking builder already enforces in its recipient SQL (lower(domain) <> ALL(blocked)). Takes effect on the next nightly build. Custom domains silently on Google Workspace are a smaller (~5%) MX-only signal, already handled in the healthcare builder via the mx_provider flag; can be ported to the main pool later if the residual warrants it.
62 lines
2.8 KiB
Python
62 lines
2.8 KiB
Python
"""Shared recipient-domain exclusions for outbound cold-email campaigns.
|
|
|
|
We self-host our MTA (transactional relays like SES forbid cold email), so we
|
|
must protect our sending-IP reputation manually. The two biggest levers:
|
|
|
|
1. NOT mailing the Yahoo/Verizon-Media family: those providers aggressively
|
|
defer cold senders with "unexpected volume / user complaints" 421
|
|
responses, which poisons the IP for every other provider too.
|
|
2. NOT mailing Google CONSUMER mailboxes (gmail.com etc.) from a cold/warming
|
|
IP: Google hard-rejects them with 550-5.7.1 "this message is likely
|
|
unsolicited mail", and those rejections are reputation-damaging. (On
|
|
2026-06-08 a warmup audit found gmail.com alone was 77% of our 550-5.7.1
|
|
blocks -- 427 of 556.) Custom domains hosted on Google Workspace are a
|
|
smaller, MX-only signal handled separately in the per-vertical builders.
|
|
|
|
Keep this list authoritative and import it everywhere we build audiences.
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
# Yahoo / Verizon Media operates ALL of these consumer domains. Legacy AT&T and
|
|
# Frontier consumer mail was handed off to Yahoo's infrastructure as well.
|
|
YAHOO_FAMILY_DOMAINS: frozenset[str] = frozenset({
|
|
# Yahoo / AOL core
|
|
"yahoo.com", "yahoo.com.mx", "yahoo.es", "yahoo.it", "yahoo.ca",
|
|
"myyahoo.com", "ymail.com", "rocketmail.com",
|
|
"aol.com", "aol.com.mx", "aim.com", "love.com", "games.com", "wow.com",
|
|
"netscape.net", "netscape.com", "cs.com", "compuserve.com",
|
|
# AT&T family (Yahoo-hosted)
|
|
"att.net", "sbcglobal.net", "bellsouth.net", "pacbell.net",
|
|
"ameritech.net", "swbell.net", "snet.net", "flash.net", "prodigy.net",
|
|
"wans.net", "nvbell.net",
|
|
# Verizon family (Yahoo-hosted)
|
|
"verizon.net", "verizongni.com", "bellatlantic.net",
|
|
# Frontier (Yahoo-hosted)
|
|
"frontier.com", "frontiernet.net",
|
|
})
|
|
|
|
# Google consumer mailboxes. Google's cold-IP spam filter (550-5.7.1) is the
|
|
# strictest of the big providers; consumer gmail accounts have the highest
|
|
# complaint sensitivity. We hold these out of cold/warmup sends. (This is the
|
|
# domain-string layer; custom domains silently on Google Workspace need an MX
|
|
# lookup and are handled in the per-vertical builders, e.g. the healthcare
|
|
# mx_provider flag.)
|
|
GOOGLE_CONSUMER_DOMAINS: frozenset[str] = frozenset({
|
|
"gmail.com", "googlemail.com",
|
|
})
|
|
|
|
# The full set of consumer domains we refuse to cold-mail. Extend here as we
|
|
# discover other reputation-sensitive providers.
|
|
BLOCKED_EMAIL_DOMAINS: frozenset[str] = YAHOO_FAMILY_DOMAINS | GOOGLE_CONSUMER_DOMAINS
|
|
|
|
|
|
def domain_of(email: str) -> str:
|
|
"""Return the lowercased domain part of an email, or '' if malformed."""
|
|
if "@" not in email:
|
|
return ""
|
|
return email.rsplit("@", 1)[-1].strip().lower()
|
|
|
|
|
|
def is_blocked(email: str) -> bool:
|
|
return domain_of(email) in BLOCKED_EMAIL_DOMAINS
|