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Mail-Archiver vs Piler: catalog facts
Mail-Archiver	Piler
Free Free and open source under the GPL-3.0 licence.	Free Free and open source to download and self-host.
Web, Self-hosted	Self-hosted
Supports IMAP, Microsoft 365 and personal Microsoft accounts Exports to mbox and zipped EML	Tamper-evident archiving with retention policies Full-text search with filtering across archived mail
Requires running a Docker setup Read-only API cannot modify the archive	Requires running and maintaining your own server Aimed at organizations rather than individual users
Self-hosted	Self-hosted
Open source	Open source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.