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Simple NixOS Mailserver vs chasquid: catalog facts
Simple NixOS Mailserver	chasquid
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the Apache 2.0 licence.
Linux, Self-hosted	Linux, Self-hosted
Whole mail server defined declaratively in NixOS configuration Releases track each NixOS release	Secure defaults that prevent open relays Virtual domains with per-domain users and aliases
Only works on NixOS Running a mail server still requires DNS and deliverability knowledge	Aimed at individuals and small groups rather than large deployments Needs Dovecot or similar for mailbox access
Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License: GPL-3.0	License: Apache-2.0
Not stated if an account is needed	No account 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.