You can't send the K-1's directly using Lacerte (I sure wish...).

You can, however, print the K-1's as PDFs from the the "K-1" package function > select File (PDF) and check the box to mask the Social Security Number.

This is a work-around for the partners being clueless about the FEIN and/or the mailing address of the entity.

You do then have to draft emails & attach the PDF.