Filters sort mail automatically, before you see it.
WHERE TO SET THEM
Server side, in cPanel > Email Filters, which applies on every device. Or in webmail under Settings > Filters. Or in your mail client, which applies only on that device.
Server-side filters are usually the right choice, because they work everywhere including your phone.
USEFUL RULES
Move newsletters into a folder so the inbox holds only mail needing a reply Route mail addressed to a particular alias into its own folder Flag messages from key customers Discard mail matching a persistent spam pattern Forward mail matching a subject keyword to a colleague
BUILDING ONE
Choose the part of the message to test, the condition, and the action. Test on a folder move before using delete, so a wrong rule does not destroy mail.
A CAUTION
A filter that discards mail leaves no trace. If a customer says they emailed and you have no record, an over-eager filter is a likely explanation. Prefer moving to a folder over deleting.