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Alternatives · 2026

The best OpenSMTPD alternatives

The rest of Best Email 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
iRedMail
WebLinuxAPI+1 $10 a year Record5.7 Visit
7
Zimbra Collaboration
AndroidiPhone & iPadWeb+4 Free plan Record5.5 Visit
8
Modoboa
WebLinuxSelf-hosted €139.30 a year Record5.4 Visit
9
poste.io
WebLinuxAPI+1 $349 a year Record5.1 Visit
10
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
11
Exim
WindowsMacLinux+1 Free plan Record4.8 Visit
12
grommunio
AndroidiPhone & iPadWeb+3 €1.99 a month Record4.7 Visit
13
Mailu
WebLinuxAPI+1 Free plan Record4.7 Visit
14
hMailServer
WindowsLinuxAPI+1 Free plan Record4.6 Visit
15
Pegasus Mail
Windows Free plan Record4.5 Visit
16
Apache James
WindowsLinuxAPI+1 Free plan Record4.4 Visit
17
Cyrus IMAP
LinuxSelf-hosted Free plan Record4.4 Visit
18
Maddy Mail Server
LinuxSelf-hosted Free plan Record4.4 Visit
19
Mail-in-a-Box
WebLinuxAPI+1 Free plan Record4.4 Visit
20
Postfix
MacLinuxSelf-hosted Free plan Record4.4 Visit
21
Docker Mailserver
LinuxSelf-hosted Free plan Record4.3 Visit
22
Dovecot
LinuxSelf-hosted Free plan Record4.2 Visit
23
RabiMail
AndroidiPhone & iPadWeb+3 ₹199 a month Record4.0 Visit
24
Whitemail
AndroidiPhone & iPadWeb Free plan Record3.5 Visit