|You can populate fields in the recipients' database by using one of the available ready-to-go integrations (e.g. ecommerce integrations) or by developing your own integration between your application and MailUp using the mailupapi.|
Multiple values profile filters
By using the two profile conditions "is one of these" and "is not one of these" you can create a filter containing multiple values separated by a comma, up to 500 characters.
In the example here below, the filter will pick up all recipients living in New York, San Francisco, Boston or San Diego.