It looks as though your next move is to try to make a list of all the aliases you have used. I believe this is possible through clever incremental use of Advanced Search. You want a list of all the distinct
X-Resolved-to headers I am short of time, but the basic approach I suggest is:
- Start by looking at the raw message of any email, noting the X-Resolved-to header's value
- Do an advanced search that excludes all messages with the known X-Resolved-to header.
- Examine the raw message of any email in the list and note the second X-Resolved-to header
- Amend the search to exclude messages with both the known X-Resolved-to headers
- and so on ...