How to Clean an Email List Before You Send

Start by removing blanks, malformed addresses, duplicates, known opt-outs, and contacts with no clear business relevance. Normalize names and company fields so personalization does not produce awkward output.

Run verification close to the sending date because domains and inboxes change. Treat uncertain results cautiously, suppress repeated bounces, and preserve one central opt-out list. Cleaning improves the inputs; it does not create permission to contact someone.