A suppression list is a list of email addresses you must never send to — people who unsubscribed, hard-bounced, or filed a spam complaint. The platform automatically blocks sends to these addresses, protecting both your compliance and your sender reputation.
What goes on it
Unsubscribes, hard bounces, repeated complainers, and any address you manually exclude. Mailpro maintains this automatically — when someone unsubscribes via your unsubscribe management, they are suppressed across future campaigns without any manual work.
Why it matters
Mailing someone who opted out is both a legal risk and a fast track to spam complaints and blacklisting. A suppression list enforces those exclusions automatically, so a removed contact stays removed. Learn more about reducing opt-outs in advanced ways to reduce unsubscribe rates.
Suppression vs deletion
Suppressing keeps a record that the address must not be contacted; deleting removes it entirely and risks re-importing it later by mistake. Suppression is the safer default. Related: unsubscribe rate, email list management, and sunset policy.
Mailpro and list management
Removed contacts stay removed, automatically
Mailpro suppresses unsubscribes, bounces, and complaints across every campaign — so you stay compliant and protect your reputation without manual checks.