Gmail Filters: How to Preview Matches Before Saving Them

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A short guide explains that people often confuse labels, folders, saved views, filters, and automations, which serve different purposes. Filters act on incoming mail going forward, while cleanups tidy existing messages and saved views only help you find them again. The author recommends using the filter builder's live preview, which shows a count and sample of matching messages, to catch overly broad conditions before saving. The example walks through creating a filter for invoices from a studio, tightening the condition after spotting an unrelated thread. Users are advised to leave the option to apply filters to existing emails off at first, and to use saved views when they only want to look at mail without changing it.

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