Lemlist Email Verification

Lemlist offers some email checking and validation integrations within its workflow. A dedicated pre-import verification step with BillionVerify applies a consistent quality policy across all your lists and data sources — independent of what the sender exposes inside its interface. That consistency matters when you import from multiple sources or reuse older lists.

Before. Warmup builds the sending reputation of your infrastructure. It does not change whether a specific address is valid or whether a specific inbox exists. Running warmup sequences toward invalid or catch-all addresses wastes warmup capacity and can introduce bounce signals that damage the reputation you are trying to build.

Route them into a separate, lower-volume segment and do not include them in LinkedIn escalation steps. A catch-all domain accepts all incoming mail at the server level, but that does not mean every address maps to a real, active inbox. Separating catch-all records keeps your main campaign metrics clean and gives you meaningful data on whether the catch-all segment is worth developing further.

Re-verify them before reuse. Any list older than 90 days should pass through BillionVerify before being imported again. Employees leave, companies restructure, domains change configuration, and enrichment data decays. Past campaign performance is not a reliable indicator of current deliverability. The cost of re-verification is low compared to the cost of a bounce spike from a stale list.

No. Verification removes bounces from invalid addresses and reduces risk from risky record types. It cannot prevent bounces caused by temporary server issues, mailbox quota limits, or catch-all addresses that turn out to be inactive. The goal is to remove the preventable risk before launching a multi-step sequence — not to guarantee zero bounces across every channel.