Message size and recipient limits in Exchange Server

Get-TransportConfig | Format-List MaxReceiveSize,MaxSendSize,MaxRecipientEnvelopeLimit

Get-TransportRule | where {($_.MessageSizeOver -ne $null) -or ($_.AttachmentSizeOver -ne $null)} | Format-Table Name,MessageSizeOver,AttachmentSizeOver




https://docs.microsoft.com/en-us/exchange/mail-flow/message-size-limits?view=exchserver-2019

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