Why do B2B email lists decay?
In short
B2B email lists decay because people change jobs, companies restructure and domains change, at roughly two to three percent a month.
The rate
Roughly two to three percent a month in European B2B, which compounds to a quarter to a third of a list over a year. A list built twelve months ago and never touched is now substantially fiction.
Why it happens
People change jobs, which is the largest single cause. Companies merge, rebrand or move domains. Role-based addresses get retired. And a proportion of any purchased list was wrong on the day it was sold.
What decay actually costs
Bounces, and bounces are not free. Mailbox providers read a high bounce rate as evidence you do not know who you are writing to, and the reputation damage affects the deliverability of the valid addresses too.
That is the part people miss. A stale list does not just waste the invalid addresses, it degrades the good ones.
How often to rebuild
Verify immediately before every send rather than trusting a purchase date. Rebuild the underlying list quarterly for stable sectors and more often where turnover is high, such as logistics and hospitality.
Rebuilding is cheaper than the reputation repair that follows sending to a decayed list.
Frequently asked
How fast do B2B email lists decay?
Why do B2B contacts go out of date?
What does a decayed list actually cost?
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