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Best Mail Server Software in 2026

• 34 apps
• Research read 23 Sept 2026
• How the order is worked out

1. 1

   Apache James

   Free plan APILinuxSelf-hosted+1
   7.7 Free plan Visit site
2. 2

   Axigen

   Free plan AndroidAPIiPhone+5
   7.7 60-day trial Visit site
3. 3 C

   Citadel

   Free plan APILinuxMac+2
   7.7 Free plan Visit site
4. 4 E

   Exim

   Free plan LinuxMacSelf-hosted+1
   7.5 Free plan Visit site
5. 5 H

   hMailServer

   Free plan APILinuxSelf-hosted+1
   7.5 Free plan Visit site
6. 6 I

   iRedMail

   Free plan APILinuxSelf-hosted+1
   7.4 Free plan · paid from $10/yr Visit site
7. 7

   Kolab

   Free plan AndroidAPIiPhone+5
   7.4 Free plan Visit site
8. 8 C

   Courier Mail Server

   Free plan LinuxSelf-hosted
   7.3 Free plan Visit site
9. 9 C

   Cyrus IMAP

   Free plan LinuxSelf-hosted
   7.3 Free plan Visit site
10. 10 D

    Dovecot

    Free plan LinuxSelf-hosted
    7.3 Free plan Visit site
11. 11

    mailcow

    Free plan AndroidiPhoneLinux+2
    7.3 Free plan Visit site
12. 12 M

    MailEnable

    Free plan AndroidiPhoneSelf-hosted+2
    7.3 Free plan · paid from $395 · 60-day trial Visit site
13. 13 M

    Mailu

    Free plan APILinuxSelf-hosted+1
    7.2 Free plan Visit site
14. 14 H

    Haraka

    Free plan Self-hosted
    7.1 Free plan Visit site
15. 15 P

    poste.io

    Free plan APILinuxSelf-hosted+1
    7.1 Free plan · paid from $349/yr Visit site
16. 16 M

    Maddy Mail Server

    Free plan LinuxSelf-hosted
    7.0 Free plan Visit site
17. 17

    Mail-in-a-Box

    Free plan APILinuxSelf-hosted+1
    7.0 Open source Visit site
18. 18 M

    Modoboa

    Free plan LinuxSelf-hostedWeb
    7.0 Free plan Visit site
19. 19 O

    OpenSMTPD

    Free plan LinuxMacSelf-hosted
    7.0 Free plan Visit site
20. 20

    SmarterMail

    Free plan AndroidiPhoneLinux+3
    7.0 Free plan · paid from $500 · 30-day trial Visit site
21. 21

    Stalwart Mail Server

    Free plan APILinuxMac+3
    7.0 Free plan · paid from $2.40/yr · 30-day trial Visit site
22. 22

    Zimbra Collaboration

    Free plan AndroidiPhoneLinux+4
    6.9 Free plan Visit site
23. 23 Q

    qmail

    Free plan LinuxSelf-hosted
    6.7 Free plan Visit site
24. 24 P

    Postfix

    Free plan LinuxMacSelf-hosted
    6.6 Open source Visit site
25. 25 Z

    Zentyal Server

    by Zentyal Server

    Free plan Linux
    6.5 Free plan · paid from $230/yr · 15-day trial Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

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