For IMAP problems, please solve them ~~~~~

For IMAP problems, please solve them ~~~~~ I recently used IMAP, and it is quite difficult to have a problem:
For example, if you have 2 million email accounts, you need to get emails of a topic from these 20 thousand email accounts. if you use IMAP, you can get emails of a topic, however, if accounts need to return emails and close the stream constantly, it may be easy to crash, even if the script does not crash for a long time, do you have any good solutions?

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No one answered the question ~~~~~~~~~~~~~~~~~

I have never studied IMAP, but according to the scenario you mentioned, I don't think there should be any other method, unless this design was done early in the morning.