No todos los correos tienen problema, son sólo algunos en algunos momentos. En los log del servidor no me indica nada, busco por la dirección de correo que nos envia el correo y no la encuentra. Puedo mostraros mi main.cf para ver si veis algo extraño. command_directory = /usr/sbin daemon_directory = /usr/lib/postfix unknown_local_recipient_reject_code = 450 sendmail_path = /usr/sbin/sendmail newaliases_path = /usr/bin/newaliases mailq_path = /usr/bin/mailq setgid_group = maildrop manpage_directory = /usr/share/man sample_directory = /usr/share/doc/packages/postfix/samples readme_directory = /usr/share/doc/packages/postfix/README_FILES mail_spool_directory = /var/mail virtual_maps = hash:/etc/postfix/virtual relocated_maps = hash:/etc/postfix/relocated transport_maps = hash:/etc/postfix/transport masquerade_exceptions = root masquerade_classes = envelope_sender, header_sender, header_recipient myhostname = itsmo94.com masquerade_domains = mydestination = itsmo94.com disable_dns_lookups = no mailbox_command = mailbox_transport = strict_rfc821_envelopes = no smtp_sasl_auth_enable = no smtpd_sasl_auth_enable = no smtpd_use_tls = no smtp_use_tls = no alias_maps = hash:/etc/aliases mailbox_size_limit = 393216000 message_size_limit = 178257920 myorigin = itsmo94.com smtpd_recipient_restrictions = permit_mynetworks, check_sender_access hash:/etc/postfix/usuarios , reject_unknown_recipient_domain, reject_unknown_sender_domain, reject_unauth_destination html_directory = /usr/share/doc/packages/postfix/html maximal_queue_lifetime = 1d #smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/access