Roundcube
App in the BluixApps catalog
What it is
Roundcube is a browser-based IMAP client — the most widely deployed self-hosted webmail interface in the world. PHP-based, MySQL-backed, with a desktop-class UI, drag-and-drop messaging, address book, custom themes. Drop-in webmail for any IMAP-compatible mail server.
For mail providers needing a webmail UI, Roundcube is the universal choice.
What it's for
- Webmail interface — browser access to IMAP mailboxes
- Multi-mailbox UI — single login, multiple accounts
- Address book — contacts management with CardDAV sync
- HTML email composition — rich text editor for composition
- Mobile-friendly UI — responsive design for phones / tablets
Who it's for
- Mail server operators providing webmail to users
- Hosting providers offering webmail with shared hosting plans
- Privacy-bound orgs running internal webmail
- Small businesses with on-prem mail servers
- Self-hosters accessing personal mail via browser
Why teams pick Roundcube over alternatives
- GPL-3.0 — fully open
- Universal compatibility — any IMAP server works
- Theme + plugin ecosystem — customizable for branding
- Mature — production-deployed at scale for 15+ years
- i18n complete — translated to 80+ languages
- Lightweight — runs on minimal hardware
Integrations
- IMAP backends — Dovecot, Cyrus, Courier-IMAP, any IMAP4
- SMTP — any SMTP server for sending
- Auth — IMAP-pass-through, LDAP, SSO via reverse proxy
- Address book — CardDAV sync for contact integration
- Plugins — calendar, two-factor auth, encryption, custom themes
- Database backends — MySQL, Postgres, SQLite
- Spam filters — Sieve filter management via UI
Notable users & community
- 6k+ GitHub stars
- Default webmail in cPanel, Plesk, virtualmin shared hosting
- Used by countless hosting providers worldwide
- Active community + plugin marketplace
- Long-running OSS project (>17 years)
Tips & operations
- Persistent volume for config + storage — config.inc.php and mail storage
- HTTPS only — never run Roundcube on plain HTTP; password leak risk
- Configure SMTP correctly — sending depends on IMAP + SMTP both configured
- DKIM signing — if you run the mail server, ensure DKIM is signing outbound
- Backup is database + config — sessions + drafts in DB; users in IMAP
- Update regularly — webmail is internet-facing; patch frequently
What we ship in BluixApps
- Docker compose: Roundcube + MariaDB
- Pinned
roundcube/roundcubemail:1.6(release-tagged) - HTTPS via Let's Encrypt
- Admin via env config
- Persistent MariaDB + plugins volume
- Sample config for common IMAP backends documented
- Backup hook covers MariaDB
Get this app — pick a BluixApps plan
Same catalog. Scaling tenant isolation, white-label and support tier.
| Tier | Tenants | Catalog | Support | White-label | Monthly | |
|---|---|---|---|---|---|---|
| Stacks | 1 | 19 curated stacks | Standard | — | $19/mo | DetailDeploy |
| Starter | 10 | Full catalog | Standard | +$15–25/mo | $49/mo | DetailDeploy |
| Pro | 25 | Full catalog | Priority bugfix | +$15–25/mo | $149/mo | DetailDeploy |
| Growth | 100 | Full catalog | Priority bugfix | +$15–25/mo | $349/mo | DetailDeploy |
| Scale | 500 | Full catalog | 7-day window | +$15–25/mo | $799/mo | DetailDeploy |
| Enterprise | Unlimited | Full catalog | Priority 7-day | Bundled | $1,499/mo | DetailDeploy |