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chasquid vs Simple NixOS Mailserver: catalog facts
chasquid	Simple NixOS Mailserver
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the GPL-3.0 licence.
Linux, Self-hosted	Linux, Self-hosted
Secure defaults that prevent open relays Virtual domains with per-domain users and aliases	Whole mail server defined declaratively in NixOS configuration Releases track each NixOS release
Aimed at individuals and small groups rather than large deployments Needs Dovecot or similar for mailbox access	Only works on NixOS Running a mail server still requires DNS and deliverability knowledge
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: Apache-2.0	License: GPL-3.0
No account 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.