2 Options: 1: Exchange Online Protection: https://www.microsoft.com/en-ie/microsoft-365/exchange/exchange-email-security-spam-protection https://www.microsoft.c

2 Options: 1: Exchange Online Protection: https://www.microsoft.com/en-ie/microsoft-365/exchange/exchange-email-security-spam-protection https://www.microsoft.com/en-ie/microsoft-365/exchange/excha.... It can also filter incoming email before it gets to your main server. looks to be around $1 per user per month... 2: Migadu: https://www.migadu.com https://www.migadu.com. their micro plan allows you to run multiple domains, but is limited on outbound email numbers... they act as your in and outgoing provider... its about $20 for the year... Neither option is free, but at least someone won't pull the plug on the service... to an extent...