Suppression List
A list of addresses or domains deliberately excluded from sending or logging. The mechanism that keeps competitors, colleagues and private correspondence out of your marketing and your CRM.
Also called: Never-Log List, Do Not Email List
What it is
A suppression list names addresses or whole domains that a system must not act on: not emailed, or not logged to the CRM, depending on the list. It is subtractive by design — an explicit exception to an otherwise automatic behaviour.
The two kinds, frequently confused
Sending suppression: addresses that must never receive marketing email — unsubscribes, competitors, bounced addresses, anyone whose consent has lapsed.
Logging suppression, often called a never-log list: addresses whose correspondence must not be written into the CRM at all. Your lawyer, your doctor, a candidate you are interviewing.
Why the logging list matters more than people expect
CRMs that log email from a connected inbox log all of it by default. Without a never-log list, private correspondence lands on a shared record where the whole team can read it. Most portals have both a personal list and a global one, and the personal list protects only its owner — a distinction worth knowing before assuming you are covered.
Domains over addresses
Suppress the domain where the whole organisation should be excluded. Address-by-address suppression fails the moment someone uses a different mailbox at the same company.
RELATED TERMS
CRM
The system of record for customer relationships — the accounts, people, deals and interactions a revenue team works from. Its value is decided by what is entered into it, not by which vendor supplies it.
Data Governance
The rules determining who may change what, how changes are reviewed, and how they are recorded. The control that stops a designed system from drifting back to whatever it was before.
Data Hygiene
The continuous practice of keeping records accurate, complete and current — as distinct from data quality, which is the state that practice produces.
COMMON QUESTIONS
- What is a never-log list?
- A suppression list applied to CRM logging rather than sending: correspondence with these addresses is never written to a record. Most systems have both a personal and a global version, and they behave differently.
- Does unsubscribing add someone to the suppression list?
- To the sending suppression list, yes, automatically. It has no effect on logging, which is a separate control.
- Should I suppress competitor domains?
- For marketing sending, usually yes. It keeps competitors out of nurture and stops their engagement distorting your scoring and reporting.
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