si.Mail Alternatives
si.Mail is described as 'Published under GPL (you don’t have to pay for it if you are using it, full source code availability)' and is a Email Client in the office & productivity category. There are seven alternatives to si.Mail for a variety of platforms, including Windows, Linux, BSD, Mac and PortableApps.com. The best alternative is Thunderbird, which is both free and Open Source. Other great apps like si.Mail are Microsoft Office Outlook, Claws Mail, Kontact - KMail and Sylpheed.
si.Mail alternatives are mainly Email Clients but may also be Calendar Apps or News Readers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of si.Mail.Thunderbird
Do you think this is a good alternative?YesNo- Free • Open Source
- Email Client
- Calendar App
93 alternatives to Thunderbird- Mac
- Windows
- Linux
- BSD
- AppImageHub
- Snapcraft
- Flathub
- PortableApps.com
- Haiku
- Homebrew
- Chocolatey
Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.
Thunderbird Features
Microsoft Office Outlook
Do you think this is a good alternative?YesNo- Paid • Proprietary
- Email Client
- Calendar App
135 alternatives to Microsoft Office Outlook- Mac
- Windows
- Online
- Android
- iPhone
- Android Tablet
- Windows Phone
- iPad
- Apple Watch
- Android Wear
Microsoft Outlook, part of the Microsoft 365 (Office) (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
Microsoft Office Outlook Features
Claws Mail
Do you think this is a good alternative?YesNo- Free • Open Source
- Email Client
- Calendar App
- News Reader
88 alternatives to Claws Mail- Windows
- Linux
- BSD
Claws Mail is an email client (and news reader), based on GTK+, featuring
Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability.
Claws Mail Features
Kontact - KMail
Do you think this is a good alternative?YesNo- Free • Open Source
- Email Client
59 alternatives to Kontact - KMail- Linux
- BSD
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.
Kontact - KMail Features
Sylpheed
Do you think this is a good alternative?YesNo- Free • Open Source
- Email Client
48 alternatives to Sylpheed- Mac
- Windows
- Linux
- BSD
- PortableApps.com
Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).
Sylpheed Features
The Bat
Do you think this is a good alternative?YesNo- Paid • Proprietary
- Email Client
60 alternatives to The Bat- Windows
- S/MIME
- OpenPGP
The Bat! is a secure email client software, built to protect your correspondence against third-parties.
The Bat Features
Pegasus Mail
Do you think this is a good alternative?YesNo22 alternatives to Pegasus Mail- Free • Proprietary
- Email Client
- Windows
Pegasus Mail is a free, standards-based electronic mail client suitable for use by single or multiple users on single computers or on local area networks.
Pegasus Mail Features