We mainly deal with governments and other businesses in the same fairly small industry, so it's somewhat easier for us in that respect - we do know most of the entities who walk to talk to us in advance. Also, we have a good relationship with our staff and they're usually proactive about telling us when they're expecting mail coming in / we add a new supplier / etc. so we can keep an eye on mail delivery.
There's always some mail that gets blocked, of course, but it's a relatively rare occurrence.
Maybe in your case something that allows users to view and release their own quarantined mail [1] coupled with a healthy dose of training on spotting malicious emails and so on?
There's always some mail that gets blocked, of course, but it's a relatively rare occurrence.
Maybe in your case something that allows users to view and release their own quarantined mail [1] coupled with a healthy dose of training on spotting malicious emails and so on?
[1] e.g. this sort of thing https://community.spiceworks.com/topic/2474067-office-365-by... - not endorsing M365, just as an example.