Send the following on WhatsApp
Continue to ChatMicrosoft Exchange Server 2003 - Client host rejected: Greylisted for 2 minutes https://www.michalzobec.cz/microsoft-exchange-server-2003-client-host-rejected-greylisted-for-2-minutes-1772
Microsoft Exchange Server 2003 - Client host rejected: Greylisted for 2 minutes https://www.michalzobec.cz/microsoft-exchange-server-2003-client-host-rejected-greylisted-for-2-minutes-1772