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Event ID: 57 Source: MSExchangeMTA

The limit on the number of associations allowed to and from entity <X.500 Distinguished Name referring to a remote server> has been reached. The limit is 9. [MTA XFER-IN 16 34] (14)
See ME300048 for information.
See the "MTA Troubleshooting Guide" link.
In the case of Exchange Server bridgeheads configured with a large number of site connectors see ME243402 link below.
Read documents ME194589 and ME197398 from Microsoft. I solved this problem restarting Exchange services without making any modification.

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