I have been playing around with the different Anti-Virus products available and was testing out ESET Mail Security for Exchange and came across the following error that logs quite often:

Exchange 2016:- event id 1057 - eset mail security
Exchange 2016:- Event ID 1057 - ESET mail security 1

While I did not notice anything happening with the transport service and mail was flowing as normal, it seems this is a bug in the application rather than an actual problem.

If I remove ESET from the server, the above error stops logging or if I disable the Transport Agent no error logs.

Hope it helps.

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