My guess is that changelog is turned on by default.
Next, logon to your listserv host (using your list-owner address);
make sure you are in EXPORT mode (don't click EXPERT or that will
put you in BASIC); click on LIST MANAGEMENT (first tab), mouseover
LIST REPORTS, mouseover LIST ACTIVITY REPORTS.
Select appropriate list from the dropdown;
REPORT TYPE: chx HISTORY REPORT
REPORT ENTRIES: chk SPAM_COMPLAINT and AUTODEL
REPORT INTERNAL: (select a start date)
+ any other options that might be worthwhile
Click SUMBIT