Hmmm. No, it is not legal to serve an eviction notice by text message in Louisiana. Prohibited forms of notice include text, regular mail, verbal communication, and email.
Valid methods for serving a Notice to Vacate include delivering it in person to the tenant with witnesses present, posting it on the door with witnesses present (and sometimes requiring their signatures), or sending it via Certified Mail with a Return Receipt Requested.
The use of Certified Mail provides a tangible record of delivery, which is essential for legal compliance.