Report RSBCS_REORG is the only report to delete documents.

Reports SSO_DELETE_PRIVATE and RSSODFRE permit to mark documents as "deletable"

I used this approach to delete documents

-     Report RSBCS_SREQ_EXPIRE (OSS Note 1478279)

-     Report RSSO_DELETE_PRIVATE

-     Report RSSOTRCL

-     Report RSSODFRE

-     Report RSBCS_REORG (finally, to delete)

At the end, you will find just few emails (i don not know why they still exist), you can just delete them in Tx SOST.

On 1 million emails sent, 35 were not deleted

Tables impacted :

-     SOFFCONT1

-     BCST_CAM

-     BCST_RE

-     BCST_SR

-     SOC3

-     SOCS

-     SOES

-     SOFM

-     SOOD

-     SOST

Have a look on the OSS Note 988057