Причина неотправки
Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts”.
гуглю
Updated: 14 January 2013, 16:46:40
http://support.microsoft.com/kb/979175/enStart Exchange Management Console.
Expand Server Configuration and then click Hub Transport.
Click the Receive Connectors tab.
Locate the remote Exchange server receive connector that the e-mail message is trying to be sent to.
Note To determine this, you can review the send protocol logs from the server that the e-mail message is stuck in.
Right-click the receive connector and then click Properties.
NoteThis is typically the Default server_name receive connector for the remote Exchange server, unless modifications were made. If you are not sure which connector is used, receive protocol logs shows the receive connector that is used.
On the Authentication tab, make sure that the Exchange Server authentication check box is selected.
А теперь вопрос, у меня два коннектора, где в логах смотреть какой был задействован.
Updated: 14 January 2013, 18:51:47
Заметил что чаcть ошибок пересылки связана с DNS. Указал на Hub Transport Server внешние DNS в явном виде для внешних запросов, ранее был указан интерфейс, который по сути внутри. Но работало же блин.