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Event ID: 5016 Source: MSExchangeTransport

The Active Directory topology service could not discover any route to connector <connector> in the routing tables with the timestamp <date> <time>. This connector will not be used.
If this is recorded after an Exchange upgrade, EV100290 (Your Solutions - Fix Exchange 2007 SMTP Connectors with ADSIEDIT) describers how to use ADSIEDIT, and delete the "Main SMTP" connector manually.
A restart temporarely fixes the problem in my case. Still looking for a solution.
See the link to "TechNet Blog" for information on how to fix Exchange 2007 SMTP connectors with ADSIEDIT.

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