Nuestro Exchange no puede enviar correos al dominio gmx.de, el error es: gmx.de DnsConnectorDelivery Reintentar 1 "jueves, 28 de abril de 2016 14:01:05" "451-4.4.0 Primary target IP address responded with: ""554-gmx.net (mxgmx009) Nemesis ESMTP Service not available 451-4.4.0 554-No SMTP service 451-4.4.0 554-Bad DNS PTR resource record. 451 4.4.0 554 For explanation visit http://postmaster.gmx.com/en/error-messages?ip=213.97.239.210&c=rdns."" Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts." y Ahora tampoco a terra.es: terra.es DnsConnectorDelivery Reintentar 1 "jueves, 28 de abril de 2016 13:57:25" "451 4.4.0 Primary target IP address responded with: ""421 4.2.1 Unable to connect."" Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts." No estamos en ninguna blacklist, nslookup da la IP pero Telnet responde: 554-gmx.net (mxgmx008) Nemesis ESMTP Service not available 554-No SMTP service 554-Bad DNS PTR resource record. 554 For explanation visit http://postmaster.gmx.com/en/error-messages?ip=xxx.xxx. 239.210&c=rdns Se ha perdido la conexión con el host. Omito primeros digitos de ntra IP con xxx
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