Data decay
People change jobs. Work emails go dark. A verified address is true on the day you checked it, not forever.
People change jobs. Work emails go dark. A verified address is true on the day you checked it, not forever.
Why a clean list does not stay clean
B2B contact data decays because the people in it keep moving. They change jobs and the address stops working. Companies rebrand, merge, or change their email format. Mailboxes are deleted when someone leaves, and some are later recycled into spam traps.
None of that shows up in your CRM. The record still looks complete; the address behind it has quietly stopped working.
What it costs
Decayed data produces hard bounces, and those damage sender reputation. The cost is not the wasted send. It is the lasting reputational mark, and the slow recovery.
Why the rate varies
Decay is fastest for senior-turnover roles, small and fast-moving companies, and sectors with high churn. It is slower for stable roles at large employers. A single universal "percent per year" figure hides this, so treat any such figure you see quoted with suspicion.
How to deal with it
- Date your data. Know when each address was last verified, not just when it was added.
- Verify before use, not only at collection. A list verified last year proves nothing today.
- Prefer addresses confirmed recently to those inherited from old exports.
- Watch for the early signal: a rising bounce rate on an older segment while fresh ones stay clean.
This is the reason verification is not a one-off step. See list hygiene and email verification, or check a list now with the email verifier.
Ready to try it on a real list?
People change jobs. Work emails go dark. A verified address is true on the day you checked it, not forever.
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- Cold email & deliverability glossary
Plain-language definitions for the terms that come up in cold outreach and email deliverability: bounce rate, catch-all, SPF/DKIM/DMARC, sender reputation, and more.
- Bounce rate — cold email glossary
The share of sent emails a mail server refuses to deliver. A hard bounce means the mailbox does not exist; a soft bounce means it is temporarily unreachable.
- Hard bounce — cold email glossary
A permanent delivery failure: the mailbox does not exist, the domain does not accept mail, or the server has rejected the recipient for good. Hard bounces are the ones that wreck sender reputation.
- Soft bounce — cold email glossary
A temporary delivery failure: a full mailbox, a greylisting delay, or a receiving server that is down. Retrying can succeed; treating every soft bounce as a dead address thins a list for no reason.