Revert "Cambiado sistema de lastmail"

This reverts commit 5b68b1df1edcc041d6fab80f60892d0275aba32e.
Revert "Mierda De guithub"

This reverts commit 82dbcaed87a94e37a755e5509e1f6c253b8f89f2.
Revert "Soluciaonado pequeño fallo en add participant to event"

This reverts commit eddf1624f35519b04a9e94bd8f512b26d22d43c7.