I have to agree with Kemasa.
The less I’m hearing, the more I think you’re afraid to admit how fragile the system setup is.
If there a fire that took out a room, then tell us.
But even SO, there should be some plan in place to get people up and receiving emails in 24 hours, with a further amount of time given to restore corrupted email files via RAID 5 discs, etc.
But get us back up and running. Even if you made monthly account backups that you could quickly restore to get people receiving email.
The webs are working fine, but now I’m worried about them because this reflects on very poor admin decisions.