shared-mailbox

Self-hosted Google Workspace & Microsoft 365 alternative for small businesses: webmail with shared mailboxes, team calendar, contacts as a mini CRM, tasks, team chat with video calls and Fritzbox telephony (CTI). JMAP web app for Stalwart. GDPR-friendly, no per-user cost, open source (AGPL).

Roundcube plugin to populate and maintain user identities automatically on each login, based on corresponding data from the plugin's config file. Especially useful for shared mailboxes (like info@example.com) with shared IMAP namespaces.

MailDesk for WordPress is a secure, open-source, self-hosted webmail and email client plugin for WordPress Admin. Features multi-account IMAP sync, SMTP sending, Gmail/Outlook-style inbox, drafts, contacts, signatures, templates, rules, shared access, encrypted credentials, REST API, diagnostics, and extensible PHP mail transports.

Synchronize Exchange Online users with Full Access to Shared Mailboxes to HelloID Resource Owner Groupmemberships

Open-source organisational email on Cloudflare with personal and shared mailboxes

Exchange Online - Target - Permissions

Synchronizes Exchange Online Shared Mailbox Full Access Permissions to HelloID Self service productassignments

Missivus for WordPress — send WordPress email through Microsoft Graph with application permissions and a shared mailbox. No SMTP, no user login. Free, GPLv3.

Logic App repo for useful examples

Lightweight self-hosted mail server with Gmail-like webmail: shared mailboxes for teams, AI assistant, antivirus, 100 languages. Runs on 2 GB RAM.

Tag who replied to a Microsoft 365 shared mailbox, automatically - no CRM required

Bulk-remove Full Access, Send As, and Send on Behalf permissions from shared mailboxes in Exchange Online using a CSV-driven PowerShell script.

Shared mailbox access propagation checker with client/server next actions.

Hybrid Exchange disaster recovery, scenario 2: when AD, Exchange and Entra Connect are lost, gives users and shared mailboxes an Exchange Online mailbox on their existing identity (the Teams storage becomes the mailbox) and rolls everything back without losing a mail. PowerShell 5.1 and 7.

Missivus for Ghost — send Ghost transactional email through Microsoft Graph with application permissions and a shared mailbox. No SMTP, no user login. Free, GPLv3.

Private, fast hosted email with an open-source JMAP webmail: custom domains, aliases and masked aliases, shared mailboxes and delegation, IMAP/SMTP/JMAP. No tracking. Built on Stalwart, run unmodified.

Synchronizes Exchange Online Shared Mailboxes to HelloID Self service products

Hybrid Exchange disaster recovery: when the Exchange servers are lost, give every mailbox an Exchange Online mailbox, then roll back. Guided console, backups, PowerShell 7.5+.

Exchange On-Premise - Target - Permissions

Identifies which shared mailboxes a user can access in Exchange Online.