The Best Email Server Software in 2026
We researched email server software using vendors’ official websites, including pricing pages, plan tables, and product documentation. Rankings focus on the core job of operating mail transfer, mailbox, and delivery infrastructure, alongside value for money and verified features. This category covers email server software.
Our top picks
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Top ranked
Microsoft Exchange Online#1 of 319.3/10Managed Exchange email with Outlook access, filtering, archiving, and migration tools.
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Runner-up
Apache James#2 of 319.1/10A flexible self-hosted mail platform with broad protocol support and configurable storage.
Free plan
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Top-ranked free plan
Dovecot#3 of 319.0/10A focused, self-hosted mailbox server with filtering, search, and migration tools.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. How we rank.
The full ranking 31 tools, best first
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Best forBusinesses wanting managed Exchange email
Managed Exchange email with Outlook access, filtering, archiving, and migration tools.
9.3/10★★★★★Visit Microsoft -
Best forTeams building a flexible self-hosted mail platform
A flexible self-hosted mail platform with broad protocol support and configurable storage.
9.1/10★★★★★Visit Apache James -
Best forOperators needing a mature IMAP/POP mailbox server
A focused, self-hosted mailbox server with filtering, search, and migration tools.
9.0/10★★★★☆Visit Dovecot -
Best forTeams wanting hosted email plus collaboration tools
Hosted business email with calendars, mobile sync, and team collaboration features.
8.8/10★★★★☆Visit IceWarp -
Best forOrganizations seeking self-hosted email and groupware
A flexible email and groupware suite for organizations that want deployment control.
8.7/10★★★★☆Visit Zimbra -
Best forSynology NAS users hosting organizational email
A full-featured mail server for organizations already running compatible Synology NAS hardware.
- Directory integration
- Mailbox server
- Integrated mail server
8.6/10★★★★☆Visit Synology -
Best forWindows teams wanting a free mail server with webmail
MailEnable combines core mail protocols and webmail with optional admin, spam and clustering features.
8.5/10★★★★☆Visit MailEnable -
Best forSmall teams self-hosting a complete mail setup
A free, open-source mail server bundle for small teams ready to administer their own infrastructure.
8.4/10★★★★☆Visit Mail-in-a-Box -
Best forOrganizations needing self-hosted mail with native mobile
A self-hosted mail server with native mobile access and collaboration tools.
8.3/10★★★★☆Visit Axigen -
Best forWindows organizations needing an integrated mail server
An integrated Windows mail server with webmail, directory support, and email controls.
- Directory integration
- Mailbox server
- Integrated mail server
8.2/10★★★★☆Visit MDaemon -
Best forTeams able to operate their own mail infrastructure
A self-hosted mail suite with integrated webmail, calendars, spam filtering, and admin tools.
8.1/10★★★★☆Visit mailcow -
Best forTeams assembling a self-hosted mail stack with support
A flexible mail stack for teams that want to operate email on their own servers.
8.0/10★★★★☆Visit iRedMail -
Best forOperators focused on scalable IMAP and mailbox services
A self-hosted mailbox server with broad access protocols and clustering options.
7.9/10★★★★☆Visit Project Cyrus -
Best forTeams seeking a free self-hosted mail server
A free, all-in-one mail server for teams prepared to operate their own infrastructure.
7.8/10★★★★☆Visit Mailu -
Best forSmall Windows teams running a free mail server
A free Windows mail server with core protocols and configurable filtering.
7.7/10★★★★☆Visit hMailServer -
Best forAdministrators needing a configurable SMTP transfer agent
A configurable, self-hosted MTA for administrators who manage mail delivery.
7.6/10★★★★☆Visit Exim -
Best forOperators needing a mature SMTP routing and delivery server
A mature SMTP server for operators who manage mail routing and delivery themselves.
7.5/10★★★★☆Visit Postfix -
Best forAdministrators needing a lightweight SMTP relay and router
A free, self-hosted SMTP relay and router for administrators—not a mailbox server.
- Mail transfer agent
7.4/10★★★★☆Visit OpenSMTPD -
Best forWindows users who need a free desktop mail client
A capable desktop mail client, not an email server.
7.4/10★★★★☆Visit Pegasus Mail -
Best forTeams wanting affordable Exchange-compatible self-hosting
A self-hosted email and groupware server with broad protocol support and tiered partner support.
- Directory integration
- Mailbox server
- Integrated mail server
7.4/10★★★★☆Visit grommunio -
Best forHigh-volume senders needing scalable SMTP relay
A self-hosted SMTP relay with traffic controls and scaling, not user mailboxes.
- Mail transfer agent
7.3/10★★★★☆Visit KumoMTA -
Best forTeams seeking a modern, low-cost self-hosted mail server
A self-hosted server with broad mail protocols, collaboration tools, and a free Community edition.
7.2/10★★★★☆Visit Stalwart -
Best forSmall teams assembling a free mail platform from components
A free, open-source platform for teams that want to operate their own mail infrastructure.
7.0/10★★★★☆Visit Modoboa -
Best forTeams operating a self-hosted mail and communications server
A self-hosted server combining email, mailbox access, directory features, and communications.
- Directory integration
- Mailbox server
- Integrated mail server
6.9/10★★★☆☆Try CommuniGate Pro -
Best forSolo operators building a minimal self-hosted mail server
A self-hosted Linux mail server for operators comfortable with file-based configuration.
6.8/10★★★☆☆Visit Maddy -
Best forSmall teams wanting a packaged self-hosted mail server
A packaged self-hosted mail server with broad protocol support and a free personal-use plan.
6.7/10★★★☆☆Visit poste.io -
Best forWindows teams seeking a one-time-purchase mail server
A self-hosted Windows mail server with perpetual licenses starting at $259.
- Directory integration
- Mailbox server
- Integrated mail server
6.6/10★★★☆☆Try EVO Mail Server -
Best forOrganizations seeking an on-premises groupware server
A self-hosted mail and groupware server for organizations managing their own infrastructure.
- Directory integration
- Mailbox server
- Integrated mail server
6.5/10★★★☆☆Visit Whitemail -
Best forHigh-volume senders needing on-premises delivery analytics
A self-hosted delivery engine with tiered sending speeds and real-time statistics.
- Mailbox server
- Integrated mail server
- Mail transfer agent
6.4/10★★★☆☆Visit GreenArrow -
Best forSmall teams pairing business email with campaigns
A bundled email server and campaign tool, starting at ₹199 per mailbox monthly.
- Mailbox server
- Integrated mail server
- Mail transfer agent
6.3/10★★★☆☆Visit RabiMail -
Best forOrganizations needing a white-label mail server license
Mailbux bundles core mail protocols and white-labeling in a one-time license.
- Mailbox server
- Integrated mail server
- Mail transfer agent
6.2/10★★★☆☆Visit Mailbux
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Deployment | Mail transfer agent | Mailbox server | Integrated mail server | Score |
|---|---|---|---|---|---|---|---|---|
| 1 | Microsoft Exchange Online | No | — | — | — | — | — | 9.3 |
| 2 | Apache James | Yes | None | — | — | — | — | 9.1 |
| 3 | Dovecot | Yes | None | — | — | — | — | 9.0 |
| 4 | IceWarp | No | — | — | — | — | — | 8.8 |
| 5 | Zimbra Collaboration | Yes | None | — | — | — | — | 8.7 |
| 6 | Synology MailPlus Server | Yes | — | Self-hosted | Yes | Yes | Yes | 8.6 |
| 7 | MailEnable | Yes | — | — | — | — | — | 8.5 |
| 8 | Mail-in-a-Box | Yes | None | — | — | — | — | 8.4 |
| 9 | Axigen | No | — | — | — | — | — | 8.3 |
| 10 | MDaemon Email Server | No | — | Hybrid | Yes | Yes | Yes | 8.2 |
| 11 | mailcow | Yes | None | — | — | — | — | 8.1 |
| 12 | iRedMail | Yes | $10/user/yr | — | — | — | — | 8.0 |
| 13 | Cyrus IMAP | Yes | None | — | — | — | — | 7.9 |
| 14 | Mailu | Yes | None | — | — | — | — | 7.8 |
| 15 | hMailServer | Yes | None | — | — | — | — | 7.7 |
| 16 | Exim | Yes | None | — | — | — | — | 7.6 |
| 17 | Postfix | — | None | — | — | — | — | 7.5 |
| 18 | OpenSMTPD | Yes | None | Self-hosted | Yes | No | No | 7.4 |
| 19 | Pegasus Mail | Yes | None | — | — | — | — | 7.4 |
| 20 | grommunio | Yes | €1.99/user/mo | Hybrid | Yes | Yes | Yes | 7.4 |
| 21 | KumoMTA | Yes | $5,000/unit/yr | Self-hosted | Yes | No | No | 7.3 |
| 22 | Stalwart Mail Server | Yes | $1.09/user/yr | — | — | — | — | 7.2 |
| 23 | Modoboa | Yes | None | — | — | — | — | 7.0 |
| 24 | CommuniGate Pro | — | — | Self-hosted | Yes | Yes | Yes | 6.9 |
| 25 | Maddy Mail Server | Yes | None | — | — | — | — | 6.8 |
| 26 | poste.io | Yes | $349/yr | — | — | — | — | 6.7 |
| 27 | EVO Mail Server | No | $259 one-time | Self-hosted | Yes | Yes | Yes | 6.6 |
| 28 | Whitemail | Yes | — | Self-hosted | Yes | Yes | Yes | 6.5 |
| 29 | GreenArrow Engine On-Premises | No | $600/mo | Self-hosted | Yes | Yes | Yes | 6.4 |
| 30 | RabiMail | No | ₹199/seat/mo | Hybrid | Yes | Yes | Yes | 6.3 |
| 31 | Mailbux Self-Hosted | No | $1,499 one-time | Self-hosted | Yes | Yes | Yes | 6.2 |
Head-to-head All 15 comparisons →
- Microsoft Exchange Online vs IceWarp
- Microsoft Exchange Online vs Synology MailPlus Server
- Microsoft Exchange Online vs Mail-in-a-Box
- Apache James vs Synology MailPlus Server
- Apache James vs Mail-in-a-Box
- Dovecot vs Synology MailPlus Server
- Dovecot vs Mail-in-a-Box
- IceWarp vs Zimbra Collaboration
- IceWarp vs Synology MailPlus Server
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How we rank email server software
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update