doveadm -u "local"  mailbox create "root.from" "root.from.child" "t.o"
doveadm -u "remote" mailbox create "root\\from" "root\\from\\child"

interimap
check_mailbox_list

# delete a mailbox on the remote server, then try to use it as target for --rename
doveadm -u "remote" mailbox delete "t\\o"

! interimap --rename "root.from" "t.o"
xgrep -Fx 'local: ERROR: Mailbox t.o exists. Run `interimap --target=local --delete t.o` to delete.' <"$STDERR"

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