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Alternatives · 2026

The best Mail-in-a-Box alternatives

The rest of Best Mail Server Software, in this site's order: each with what it costs, where it runs and its record score.

1
SmarterMail
AndroidiPhone & iPadWeb+3 $500 a year Record6.3 Visit
2
MailEnable
AndroidiPhone & iPadWeb+2 $395 one-time Record6.1 Visit
3
mailcow
AndroidiPhone & iPadWeb+2 €8.90 a month Record5.9 Visit
4
Stalwart Mail Server
WebWindowsMac+3 $1.09 a year Record5.9 Visit
5
Axigen
AndroidiPhone & iPadWeb+5 Free plan Record5.8 Visit
6
IceWarp
AndroidiPhone & iPadWeb+4 $1.35 a month, billed yearly Record5.5 Visit
7
Kolab
AndroidiPhone & iPadWeb+5 Free plan Record5.5 Visit
8
Zimbra Collaboration
AndroidiPhone & iPadWeb+4 Free plan Record5.5 Visit
9
Modoboa
WebLinuxSelf-hosted €139.30 a year Record5.4 Visit
10
iRedMail
WebLinuxAPI+1 $10 a year Record5.2 Visit
11
poste.io
WebLinuxAPI+1 $349 a year Record5.1 Visit
12
Microsoft Exchange Online

It suits businesses needing hosted email, calendars, contacts, administration, and compliance controls across major devices.

AndroidiPhone & iPadWeb+2 $4 a month, billed yearly Record5.0 Visit
13
Kerio Connect
AndroidiPhone & iPadWeb+5 — Record4.9 Visit
14
Citadel
WebMacLinux+2 Free plan Record4.8 Visit
15
Exim
WindowsMacLinux+1 Free plan Record4.8 Visit
16
Mailu
WebLinuxAPI+1 Free plan Record4.7 Visit
17
hMailServer
WindowsLinuxAPI+1 Free plan Record4.6 Visit
18
Courier Mail Server
LinuxSelf-hosted Free plan Record4.5 Visit
19
MDaemon Messaging Server
AndroidiPhone & iPadWeb+2 — Record4.5 Visit
20
qmail
LinuxSelf-hosted Free plan Record4.5 Visit
21
Apache James
WindowsLinuxAPI+1 Free plan Record4.4 Visit
22
Cyrus IMAP
LinuxSelf-hosted Free plan Record4.4 Visit
23
HCL Domino
AndroidiPhone & iPadWeb+4 — Record4.4 Visit
24
Maddy Mail Server
LinuxSelf-hosted Free plan Record4.4 Visit