Change SMTP Banner and Transaction Time

SMTP Banner:
Set-ReceiveConnector “name of the connector” -Banner “220 mail.contoso.com Contoso Mail Server”

Transaction Time:
get-ReceiveConnector | select name,tarpitinterval
set-ReceiveConnector “Default Frontend” -tarpitinterval 00:00:00

By default Microsoft delays incoming smtp connections with 5 seconds to try and prevent spam.

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