请问HN：归档25年电子邮件的最佳方法是什么？
我从1997年到1998年起的所有邮件都集中在一个巨大的收件箱里，目前在Gmail上使用Mac的eM Client作为邮件客户端（最开始使用过大约十种服务，从自托管开始）。我希望将这25年来的历史邮件进行归档，但要确保将来可以搜索和使用（并且可能可以导入到新的邮件客户端/服务中），而不是以任何可能会过时的特定邮箱格式存储。除了“我想这么做”之外，没有什么好的理由去囤积这些邮件。请问有哪些最佳选项和工具？
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I have emails from 1997-98 onwards all in one massive inbox, currently on gmail with emclient on Mac as the mail client (there have been probably a dozen services starting from self-hosted in the beginning). I would like to archive the historic mails for the first 25 years, but in a way that's actually searchable and usable in the future (and potentially importable to a new mail client/service) and not in any particular mailbox format that may go obsolete. There is no good reason to hoard them, other than "I feel like doing so". What are the best options, and tools?