You send to a list
A few dead addresses are enough to get your sending suspended.
Sending platforms watch your bounces: Brevo suspends an account above 2% on a send to new contacts, HubSpot at 5% in a month. Each bounce also wears down your sender reputation, the one that decides whether the rest of your mail arrives.
400bounces from a single send to 10,000 new contacts with 4% dead addresses. Brevo suspends an account past 200.
Your list
a.kowalski@example.com
contact@example.org
priya.shah@example.com
j.okafor@example.net
info@old-site.example
s.tanaka@example.com
lucia.romero@example.org
m.dubois@example.net
