Extract contacts from emails in mailboxes with LetsExtract

LetsExtract can connect directly to mail servers using POP3 and IMAP protocols. This function can be useful, if you want to extract, for example, addresses of clients with whom there was correspondence from a corporate mail before.

Update: This feature is best described in the documentation for LetsExtract 7: https://letsextract.com/docs/mailbox_search.htm.