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huge email Q with deferred message 451 4.7.1


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Third party email gateway (on-prem) huge email Q with deferred message 451 4.7.1  ------ > MS Exchange 2016 (running on-prem Windows Server 2016)  -----> ESET for Exchange 7.3.10011.0 (default setup) : any suggestion as to how to resolve this issue as am new to emsx

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  • ESET Staff

Hi, ESET Mail Security for Exchange uses '451 4.7.1 Please try again later' response for greylisted messages, but Greylisting is turned off by default. Have you checked in-product logs or transaction logs to verify whether messages were rejected by Mail Security?

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