For dynamic lists

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A promotional list with frequent sign-ups or a BB list tends to decay faster—subscribers often join for one-time offers or people switch jobs, making contacts outdated. On the other hand, a BC list or a long-term subscriber list, carefully curated over time with genuine interest, tends to be more reliable. These subscribers are less likely to churn unless their email usage changes or accounts become inactive.

, make verification a habit every months to keep everything fresh. Static lists can often go longer, around – months between checks. Our advice? You can run re-engagement campaigns norway phone number targeting subscribers who have not been engaging for – months. However, if there’s no improvement in their activity, consider removing them to maintain a more engaged and responsive email list. How Big Is The List? The size of your list matters. Small, niche lists are easier to maintain and don’t need frequent verification or cleaning.

The bigger the list, the higher the chances of outdated, invalid, or inactive addresses sneaking in. Even a small percentage of invalid entries can translate into significant deliverability issues for large lists. For large lists (thousands or millions of contacts), try to verify every - months or whenever you add a substantial number of new entries. For smaller lists, quarterly verification should suffice to maintain accuracy and engagement Our advice? Focus on quality over quantity when building your email list.