SmtpResponse exception in constructor

I’m updating our spamfilter from Exchange 2013 to 2019. My transport agent references these two DLLs: Microsoft.Exchange.Data.Common.dll Microsoft.Exchange.Data.Transport.dll Both of the following lines of code generate an exception, when I replace the 2013 versions of these DLLs with the new ones from Exchange 2019: // Exchange 2019 syntax SmtpResponse smtpResponse = SmtpResponse.Create(“550”, “5.7.1”, “A single…

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