MailHog
Mail ServersEmail testing tool with a fake SMTP server
Replaces Mailtrap
Best Lightweight Mail Servers for self-hosting
The 52 best Lightweight mail servers you can self-host, ranked by community traction.
Mailpit
Mail ServersEmail and SMTP testing tool with web UI
Replaces Mailtrap, MailHog
Mailpile
Mail ServersPrivacy-focused, searchable email client
Replaces Gmail
Himalaya
Mail ServersModern command-line email client written in Rust
Replaces Mutt, Outlook
MailCatcher
Mail ServersCatch-all SMTP server for inspecting test email
Replaces Mailtrap
Maddy Mail Server
Mail ServersComposable, all-in-one mail server in Go
Replaces Google Workspace, Microsoft 365
Mox
Mail ServersModern, secure all-in-one mail server
Replaces Google Workspace, Microsoft 365
Haraka
Mail ServersHigh-performance, pluggable SMTP server in Node.js
Replaces SendGrid, Mailgun
imapsync
Mail ServersSynchronization and migration tool between IMAP accounts
Replaces IMAP migration services
smtp4dev
Mail ServersFake SMTP server for development email testing
Replaces Mailtrap
NeoMutt
Mail ServersFeature-rich terminal email client
Replaces Microsoft Outlook
aerc
Mail ServersEfficient terminal-based email client
Replaces Gmail, Outlook
Rspamd
Mail ServersFast, modern spam filtering system
emailwiz
Mail ServersScript to deploy a full Postfix/Dovecot mail server
Replaces Google Workspace
Mailvelope
Mail ServersBrowser extension for OpenPGP encryption in webmail
Replaces ProtonMail
Cypht
Mail ServersLightweight webmail aggregator for many accounts
Replaces Gmail, Outlook Web
SnappyMail
Mail ServersLightweight, fast and modern webmail client
Replaces Gmail, Outlook Web
swaks
Mail ServersSwiss Army knife for SMTP testing
Replaces Mailtrap
parsedmarc
Mail ServersParser and dashboard for DMARC aggregate reports
Replaces Dmarcian, Valimail
Dovecot
Mail ServersSecure, high-performance IMAP and POP3 server
Replaces Microsoft Exchange
PostfixAdmin
Mail ServersWeb interface for managing Postfix mail domains
Replaces cPanel Email
chasquid
Mail ServersSimple, easy-to-configure SMTP server
Replaces Google Workspace
Sup
Mail ServersConsole-based threaded email client
Replaces Mutt
imapfilter
Mail ServersScriptable IMAP mail filtering utility
Replaces Gmail filters
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
Sieve Editor
Mail ServersGraphical editor for Sieve mail filtering scripts
Replaces Gmail filters
alot
Mail ServersTerminal-based mail user agent for notmuch
Replaces Mutt
alps
Mail ServersSimple and extensible web-based email client
Replaces Gmail
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
OpenSMTPD
Mail ServersSecure and simple SMTP server from OpenBSD
Replaces Sendmail, Postfix
Postfix
Mail ServersFast, secure and reliable mail transfer agent
Replaces Microsoft Exchange
ViMbAdmin
Mail ServersWeb interface for managing virtual mail domains
Replaces cPanel email
isync
Mail ServersIMAP and Maildir mailbox synchronizer
Replaces Outlook offline mode
Afterlogic WebMail Lite
Mail ServersFree webmail front-end for IMAP and SMTP servers
Replaces Gmail, Outlook Web
Apache SpamAssassin
Mail ServersRule-based and Bayesian anti-spam mail filter
Replaces Proprietary spam filtering appliances
afew
Mail ServersInitial tagging script for the notmuch mailer
Replaces Gmail filters
msmtp
Mail ServersLightweight SMTP client for sending mail
Replaces Sendmail
fdm
Mail ServersFetch and filter mail with a single configuration
Replaces fetchmail, procmail
DragonFly Mail Agent
Mail ServersTiny mail transfer agent for outbound delivery
Replaces Sendmail, Postfix
Claws Mail
Mail ServersLightweight and fast GTK email client
Replaces Microsoft Outlook
Fetchmail
Mail ServersRemote mail retrieval and forwarding utility
Replaces Gmail import
Nullmailer
Mail ServersSimple relay-only mail transfer agent
Replaces Sendmail
getmail6
Mail ServersFlexible mail retrieval tool for POP3 and IMAP
Replaces fetchmail
OpenDMARC
Mail ServersDMARC policy enforcement filter for mail servers
Replaces Proprietary DMARC services
OpenDKIM
Mail ServersDKIM signing and verification filter for mail servers
Replaces Proprietary email security gateways
Schleuder
Mail ServersEncrypting mailing list manager with OpenPGP
Replaces Google Groups
bogofilter
Mail ServersFast Bayesian spam filter for mail systems
Replaces Proprietary spam gateways
Dovecot Pigeonhole
Mail ServersSieve mail filtering engine for Dovecot
Replaces Gmail filters
DKIMpy Milter
Mail ServersDKIM signing and verification milter for mail servers
Replaces Hosted email authentication
mpop
Mail ServersSmall POP3 client for retrieving mail
Replaces fetchmail
No apps match these filters.
At a glance
| App | Deploy effort | Difficulty | Min. RAM | License | ★ Stars |
|---|---|---|---|---|---|
| MailHog | Under-an-hour setup | Easy | 64 MB | MIT | 16,184 |
| Mailpit | Under-an-hour setup | Easy | 64 MB | MIT | 10,636 |
| Mailpile | Read-the-docs project | Medium | 512 MB | AGPL-3.0 | 8,811 |
| Himalaya | Read-the-docs project | Medium | 64 MB | MIT | 7,436 |
| MailCatcher | Under-an-hour setup | Easy | 128 MB | MIT | 6,778 |
| Maddy Mail Server | Under-an-hour setup | Medium | 256 MB | GPL-3.0 | 6,108 |
| Mox | Under-an-hour setup | Easy | 256 MB | MIT | 5,895 |
| Haraka | Under-an-hour setup | Medium | 256 MB | MIT | 5,615 |
| imapsync | Read-the-docs project | Medium | 64 MB | GPL-3.0 | 4,176 |
| smtp4dev | Under-an-hour setup | Easy | 128 MB | GPL-3.0 | 3,998 |
Quick picks
- Most adopted: MailHog (16,184 GitHub stars).
- Lightest footprint: swaks (from 16 MB RAM, against 1,024 MB for the heaviest here).
- Licensing: 14 of 52 use GPL-3.0; check the rest individually if you plan to modify and redistribute.
Every option here is open-source and self-hostable, tagged Lightweight within the mail servers category. Deploy effort is graded from published container recipes, not vendor claims — see the methodology.