LPS-49600 Revert "LPS-29279 Make sure mailId is unique for every single mail"

This reverts commit 127761da35f83d453da7beab6080a0ee46b97be4.
LPS-49600 Add ability to append a generated unique mailId
LPS-49600 Fix MB which uses In-Reply-To header
LPS-49600 Simplify solution
LPS-49600 Do not chain
LPS-49600 Include missing setAddUniqueId
LPS-49600 Rename it to uniqueMailId
LPS-49600 Make it work
LPS-49600 Sort
LPS-49600 Fix another usage of ArrayUtil.append()
LPS-49600 Sort