In MailChimp, our tools focus on maintaining subscriber information, bounce data, and unsubscribes as a way to maintain list health over the life of a campaign. If your list needs to be validated, we recommend using tools and services specifically designed for list cleaning.

Internet service providers (ISPs), anti-spam groups, and corporate email protection services set specific thresholds regarding spam complaints, undeliverable mail, and unsubscribe requests. As a bulk delivery service we're required to enforce these thresholds. Doing so helps us maintain our sending reputation and high deliverability standards and helps ensure that when you send campaigns using MailChimp, your emails reach your subscribers.

If you send a campaign to an old or stale list using MailChimp, you may see a high number of spam complaints, undeliverable mail (bounces), or unsubscribes. These can raise red flags in our system and lead to account warnings or even permanent account suspension. We really don't want that to happen, so it's best to use a service that's specifically designed to clean your list before uploading it to MailChimp.

MailChimp provides tools that help you maintain subscriber data, including unsubscribes and cleaned addresses. For each campaign, MailChimp will "clean" your list by removing unsubscribes, bad addresses, syntax errors, and duplicates from your list, but our application was not built as a list cleaner. To clean your list of bad addresses, we recommend using tools and services specifically designed for that purpose, like one of these.

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