I get alway a Message Delivery Delay
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MailEnable: Message delivery has been delayed. Message is waiting at myserver.com for delivery to mx.domain.com The message will be retried for another 24 hours. Reason: Could not deliver this message to the remote host domain.com because the connection either failed or was refused. MailEnable will keep trying to deliver this message and will notify you of any progress. Message headers follow: ....
This thing doesn't happen when I send emails from other mail servers
and the destination mail server administrator say that he doesn't have any problem into receiving emails.