cross-posted from: https://bolha.forum/post/199189
I need indications of email servers that accept relay transmission.
The MX will point to the Microsoft Exchange server, but emails that do not exist on the MS server will be relayed to this secondary server.
MS does sell just-email licenses: https://www.microsoft.com/en-us/microsoft-365/exchange/compare-microsoft-exchange-online-plans
Or, you could probably just get some just-Office licenses for the 10, and keep all your email on the secondary server. Trying to relay half your mail sounds like a mess.