Adding these steps

step 6.

check if we have still them message stored, ok as expected

[@ testtest]# grep 45765765870 /home/popusers/testtest/mdbox/storage/* /home/popusers/testtest/mdbox/storage/m.893:Subject: New file uploaded 45765765870

step 7.

purge mailbox with

[@ testtest]# doveadm -v purge -u testtest

step 8.

check if we have still them message stored, no, ok as expected

[@ testtest]# grep 45765765870 /home/popusers/testtest/mdbox/storage/* [@ testtest]#