Ya solucione lo de porque tenia que escribir
[email protected]ldomain, solo era que tenia asi en $mydestination. Ahora solo me falta resolver lo de el correo externo, aun no logro recibir correos desde servidores externos, internamente todo trabaja perfectamente. Aqui pongo mi main.cf
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
setgid_group = postdrop
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no
# Uncomment the next line to generate "delayed mail" warnings
delay_warning_time = 4h
command_directory = /usr/sbin
daemon_directory = /usr/lib/postfix
program_directory = /usr/lib/postfix
myhostname = servidor.tecvallarta.edu.mx
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = tecvallarta.edu.mx,servidor.tecvallarta.edu.mx, localhost.tecvallarta.edu.mx, localhost
relayhost =
mynetworks = 127.0.0.0/8, 192.168.0.0/24
mailbox_command =
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
local_recipient_maps =
mailbox_transport = lmtp:unix:/var/run/cyrus/socket/lmtp
smtp_sasl_auth_enable = no
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = servidor
smtpd_recipient_restrictions =
permit_mynetworks,
permit_sasl_authenticated,
reject_unauth_destination
smtpd_sasl_security_options = noanonymous
---Cualquier ayuda se agradece de antemano.---