Mautic
Mail ServersOpen-source marketing automation platform
Replaces HubSpot, Marketo
Best Plugins Mail Servers for self-hosting
The 10 best Plugins mail servers you can self-host, ranked by community traction.
Roundcube
Mail ServersBrowser-based IMAP webmail client
Replaces Gmail, Outlook Web
Haraka
Mail ServersHigh-performance, pluggable SMTP server in Node.js
Replaces SendGrid, Mailgun
Cypht
Mail ServersLightweight webmail aggregator for many accounts
Replaces Gmail, Outlook Web
SnappyMail
Mail ServersLightweight, fast and modern webmail client
Replaces Gmail, Outlook Web
Apache James
Mail ServersEnterprise mail server and SMTP/IMAP platform
Replaces Microsoft Exchange
Nextcloud Mail
Mail ServersIMAP webmail client integrated into Nextcloud
Replaces Gmail
Betterbird
Mail ServersCommunity-enhanced fork of the Thunderbird email client
Replaces Microsoft Outlook
Apache SpamAssassin
Mail ServersRule-based and Bayesian anti-spam mail filter
Replaces Proprietary spam filtering appliances
Claws Mail
Mail ServersLightweight and fast GTK email client
Replaces Microsoft Outlook
No apps match these filters.
At a glance
| App | Deploy effort | Difficulty | Min. RAM | License | ★ Stars |
|---|---|---|---|---|---|
| Mautic | Under-an-hour setup | Hard | 2,048 MB | GPL-3.0 | 10,760 |
| Roundcube | Under-an-hour setup | Easy | 256 MB | GPL-3.0 | 7,217 |
| Haraka | Under-an-hour setup | Medium | 256 MB | MIT | 5,615 |
| Cypht | Under-an-hour setup | Medium | 128 MB | LGPL-2.1 | 1,765 |
| SnappyMail | Under-an-hour setup | Easy | 128 MB | AGPL-3.0 | 1,712 |
| Apache James | Under-an-hour setup | Hard | 2,048 MB | Apache-2.0 | 1,050 |
| Nextcloud Mail | Read-the-docs project | Easy | 512 MB | AGPL-3.0 | 1,038 |
| Betterbird | Read-the-docs project | Easy | 256 MB | MPL-2.0 | 991 |
| Apache SpamAssassin | Read-the-docs project | Medium | 256 MB | Apache-2.0 | 344 |
| Claws Mail | Read-the-docs project | Easy | 128 MB | GPL-3.0 | 200 |
Quick picks
- Most adopted: Mautic (10,760 GitHub stars).
- Lightest footprint: Cypht (from 128 MB RAM, against 2,048 MB for the heaviest here).
- Licensing: 3 of 10 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 Plugins within the mail servers category. Deploy effort is graded from published container recipes, not vendor claims — see the methodology.