Hi ootem,
>> I know the valid range for this setting is 1 to 100000, and I realize this will definitely impact the server performance
Normally, although the valid range for this setting is 1 to 100000 in theory, it can still be affected by many other aspects. In many cases, we may not directly set it to the maximum value. For your example, Database can be out of load.
Considering your situation, instead of retrieving data from server, we can keep emails in local PST files by year as a workaround. Then you are able to search these PST data files locally to get the emails you need.
Hope this can be helpful.
Regards,
Aidan Wang
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