The Print Envelopes action on the People Search Results page allows you to print an envelope for the preferred mailing address for the selected people records. Note that in order to use this action, you must select a Default Envelope in your Mail Record User Preferences.
To print envelopes:
Search for the People records that you want to print envelopes for.
When the records appear on the Search Results page, click the Select All link at the top of the page to select the check boxes next to all records found. If you want to print envelopes for only selected records, select the check box next to those records.
Select the Print Envelopes action.
The envelopes will print to the Default Envelope Printer that is selected in your User Preferences.