nc unix_listen .test-sock

mda = ./mda-lmtp --addr=.test-sock --addr_network=unix \
        -f from -d to < test-email

nc -> 220 Hola desde expect

nc <~ LHLO .*
nc -> 250-Bienvenido!
nc -> 250 Contame...

nc <- MAIL FROM:<from>
nc -> 250 Aja

nc <- RCPT TO:<to>
nc -> 250 Aja

nc <- DATA
nc -> 354 Dale

nc <- Subject: test
nc <-
nc <- This is a test.
nc <- .

nc -> 452 Nananana

mda <- Delivery failed remotely: 452 Nananana
mda wait 75