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awesome-selfhosted
A list of Free Software network services and web applications which can be hosted on your own servers
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ImapSync
Imapsync is an IMAP transfers tool. The purpose of imapsync is to migrate IMAP accounts or to backup IMAP accounts. IMAP is one of the three current standard protocols to access mailboxes, the two others are POP3 and HTTP with webmails, webmails are often tied to an IMAP server. Upstream website is
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Migrating your mails to any new server should be easy assuming both have imap. https://github.com/imapsync/imapsync
I suggest Mailcow (https://github.com/mailcow/mailcow-dockerized).