My Exchange server locked yesterday after failing to find the DC which had crashed.
Now I have a problem with 3 mailboxes.
Users A & B have allowed Full Mailbox access to User C. This was done by me over a year ago and has been working fine. No "Send As" permissions were involved at any stage.
Since yesterdays reboot, whenever User A or B send an email it is not received by the recipient (not specific ones, everyone) but User C receives a Sys Admin email in their inbox stating they do not have permission to send to the recipient(s) concerned. This email shows User C as the original sender. I have removed the full access permissions and unattached User A&B mailboxes from User C but this does not resolve it. I have deleted User C profile and recreated without resolving. I have recreated permissions setup - still no joy.
Presumably I should just delete and recreate the mailboxes now - or is there a simpler answer?