Zoho Mail alternatives

Open-source alternatives

• mailcow: dockerized

  Fit: PartialCore overlap exists; named gaps need replacing or rebuilding.Fit is not feature parity. A Tier ANo paid feature gates in the self-run edition GNU General Public License v3.0 Permissions of this strong copyleft license are conditioned on making available complete source code of licensed works and modifications, which include larger works using a licensed work, under the same license. Copyright and license notices must be preserved. Contributors provide an express grant of patent rights. May Commercial useModificationDistributionPatent usePrivate use Must License and copyright noticeState changesDisclose sourceSame license No LiabilityWarranty Summary from GitHub's choosealicense.com Self-hostable: yesYou can run it on your own server.

  Email/groupware scope only. Replaces custom-domain mailbox hosting, not the full office suite. Mailcow sync jobs copy messages from IMAP; calendars, contacts, permissions and client behavior need separate migration checks. Operator manages DNS, deliverability, backups and upgrades. Source-account IMAP/export access must be enabled (Zoho Free excludes IMAP); pilot mailbox, calendar and contact transfer separately.

• Stalwart Community

  Fit: PartialCore overlap exists; named gaps need replacing or rebuilding.Fit is not feature parity. C Tier CDaily-workflow features need a paid edition GNU Affero General Public License v3.0 Permissions of this strongest copyleft license are conditioned on making available complete source code of licensed works and modifications, which include larger works using a licensed work, under the same license. Copyright and license notices must be preserved. Contributors provide an express grant of patent rights. When a modified version is used to provide a service over a network, the complete source code of the modified version must be made available. May Commercial useModificationDistributionPatent usePrivate use Must License and copyright noticeState changesDisclose sourceNetwork use is distributionSame license No LiabilityWarranty Summary from GitHub's choosealicense.com Self-hostable: yesYou can run it on your own server.

  Email/groupware scope only. Replaces standards-based email/calendar/contact hosting, not Google or Microsoft office apps and vendor automation. Pilot IMAP/CalDAV/CardDAV migration and client behavior; vendor service migration claims do not establish a turnkey Google Workspace or Exchange Online migration. Recovery and AI mail features require Enterprise. Source-account IMAP/export access must be enabled (Zoho Free excludes IMAP); pilot mailbox, calendar and contact transfer separately.