Mailspring
Mail ServersCross-platform desktop email client
Replaces Outlook, Apple Mail
Best Offline-First Mail Servers for self-hosting
The 15 best Offline-First mail servers you can self-host, ranked by community traction.
Mailpile
Mail ServersPrivacy-focused, searchable email client
Replaces Gmail
Himalaya
Mail ServersModern command-line email client written in Rust
Replaces Mutt, Outlook
NeoMutt
Mail ServersFeature-rich terminal email client
Replaces Microsoft Outlook
aerc
Mail ServersEfficient terminal-based email client
Replaces Gmail, Outlook
Sup
Mail ServersConsole-based threaded email client
Replaces Mutt
Betterbird
Mail ServersCommunity-enhanced fork of the Thunderbird email client
Replaces Microsoft Outlook
notmuch
Mail ServersFast, tag-based email indexing and search system
Replaces Gmail search
meli
Mail ServersTerminal email client with a modern interface
Replaces Mutt, NeoMutt
alot
Mail ServersTerminal-based mail user agent for notmuch
Replaces Mutt
Lieer
Mail ServersSync Gmail with a local notmuch mail database
Replaces Gmail web interface
OfflineIMAP
Mail ServersSynchronize IMAP mailboxes to local Maildir
Replaces Outlook offline mode
isync
Mail ServersIMAP and Maildir mailbox synchronizer
Replaces Outlook offline mode
afew
Mail ServersInitial tagging script for the notmuch mailer
Replaces Gmail filters
Claws Mail
Mail ServersLightweight and fast GTK email client
Replaces Microsoft Outlook
No apps match these filters.
Every option here is open-source and self-hostable, tagged Offline-First within the mail servers category. Compare them on the individual app pages for setup difficulty and resource requirements.