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A filter in MailUp is a way to query the recipients database based on one or more conditions. They can be used to find recipients, create groups of recipients, define when certain dynamic content should be added to a message, indicate to which recipients a certain automated message should be sent, etc. A filter can contain more than one condition. For example, an ecommerce store that uses the /wiki/spaces/mailupUserGuide/pages/36503589 Magento extension for MailUp to bring order data into their MailUp account, could create a filter that looks for recipients that have purchased over 200 dollars in the last 12 months and who have not ordered for 3 months or more.
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