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Courier: Internet Email Alternatives

Courier: Internet Email is described as *'Courier was the evolution of the Calypso email client.

It kept messages and attachments, account settings, filters, address book and program settings (including UI) within a single encrypted mailbox file.

Features

  • Support for multiple email accounts
  • Configurable, intuitive'* and is a Email Client in the office & productivity category. There are more than 10 alternatives to Courier: Internet Email for a variety of platforms, including Windows, Linux, Mac, BSD and Android. The best alternative is Thunderbird, which is both free and Open Source. Other great apps like Courier: Internet Email are Microsoft Office Outlook, Claws Mail, Microsoft Mail and Calendar and Postbox.
Courier: Internet Email alternatives are mainly Email Clients but may also be Calendar Apps or Mail Servers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Courier: Internet Email.
This page was last updated

Courier was the evolution of the Calypso email client.

It kept messages and attachments, account settings, filters,...

Learn more about Courier: Internet Email

  1. Thunderbird icon

    Thunderbird

    • Mac
    • Windows
    • Linux
    • Homebrew
    • PortableApps.com
    • Chocolatey
    • Flathub
    • AppImageHub
    • Snapcraft
    • BSD
    • Haiku
    96 alternatives to Thunderbird 

    Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.

     Suggest and vote on features
    Features
    1.  Extensible by Plugins/ExtensionsThunderbird can be extended with add-ons, plugins and extensions.
    2.  Multiple Account supportThunderbird support multiple accounts without the need to logout and login
    3.  Calendar IntegrationThunderbird lets you sync your tasks and events with your calendar application.
    4.  Email OrganizerThunderbird allows you to take control of your inbox by filtering and control tools.
    5.  Dark ModeThunderbird supports dark mode for comfortable usage in low light conditions.
    6.  Support for ThemesYou can use themes and templates to change the look and feel of Thunderbird.
    7.  Integrated Password ManagerThunderbird lets you access all the passwords you’ve saved across your different devices.
    8.  Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Thunderbird.
    9.  PortableThunderbird can be used from a USB stick or similar with no prior installation.
    Screenshot
    Dark Mode
  2. Microsoft Office Outlook icon

    Microsoft Office Outlook

    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • Windows Phone
    • iPad
    • Apple Watch
    • Android Wear
    134 alternatives to Microsoft Office Outlook 

    Microsoft Outlook, part of the Microsoft Office Suite (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.

     Suggest and vote on features
    Features
    1.  Email OrganizerMicrosoft Office Outlook allows you to take control of your inbox by filtering and control tools.
    2.  Calendar IntegrationMicrosoft Office Outlook lets you sync your tasks and events with your calendar application.
    3.  Unified inboxView e-mails (or similar) from all accounts in one unified view with Microsoft Office Outlook.
    4.  Multiple Account supportMicrosoft Office Outlook support multiple accounts without the need to logout and login
    5.  Dark ModeMicrosoft Office Outlook supports dark mode for comfortable usage in low light conditions.
    6.  Email SchedulingYou can schedule a marketing, sales, or personal email for a time in the future with Microsoft Office Outlook.
    Outlook 365 on Windows
    Outlook for Mac 2016


  3. Claws Mail icon

    Claws Mail

    • Windows
    • Linux
    • BSD
    88 alternatives to Claws Mail 

    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.

     Suggest and vote on features
    Features
    1.  LightweightClaws Mail consumes less device resources compared to similar apps.
    2.  Extensible by Plugins/ExtensionsClaws Mail can be extended with add-ons, plugins and extensions.
    3.  Multiple Account supportClaws Mail support multiple accounts without the need to logout and login
    4.  No registration requiredYou can use most of the features in Claws Mail without registration.
    5.  Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Claws Mail.
    6.  Spam FilterClaws Mail can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
    7.  PortableClaws Mail can be used from a USB stick or similar with no prior installation.
    The main window
    The account preferences window
  4. Microsoft Mail and Calendar icon

    Microsoft Mail and Calendar

    • Windows
    • Windows S
    89 alternatives to Microsoft Mail and Calendar 

    Windows 10 has Mail and Calendar apps already built in.

     Suggest and vote on features
    Features
    1.  Unified inboxView e-mails (or similar) from all accounts in one unified view with Microsoft Mail and Calendar.
    Screenshot
    Screenshot
  5. Postbox icon

    Postbox

    • Mac
    • Windows
    70 alternatives to Postbox 

    Postbox is an email application that helps you organize your work life and get stuff done.

     Suggest and vote on features
    Features
    Screenshot
    Screenshot


  6. Kontact icon

    Kontact

    • Linux
    109 alternatives to Kontact 

    Personal Information Manager (Mail, Contact, Calendar and more).

    Screenshot
  7. Sylpheed icon

    Sylpheed

    • Mac
    • Windows
    • Linux
    • BSD
    • PortableApps.com
    47 alternatives to Sylpheed 

    Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).

     Suggest and vote on features
    Features
    1.  LightweightSylpheed consumes less device resources compared to similar apps.
    2.  PortableSylpheed can be used from a USB stick or similar with no prior installation.
    Main screen
    Composition window
  8. The Bat icon

    The Bat

    • Windows
    • S/MIME
    • OpenPGP
    61 alternatives to The Bat 

    The Bat! is a secure email client software, built to protect your correspondence against third-parties.

     Suggest and vote on features
    Features
    1.  PGP EncryptionThe Bat supports PGP, an encryption system used for sending encrypted emails and files.
    2.  Support for scriptingThe Bat supports scripts and macros to automate or customize tasks.
    3.  GPG EncryptionThe Bat supports GPG (aka GnuPG) for encryption of things like emails, messages, files, etc.
    4.  PortableThe Bat can be used from a USB stick or similar with no prior installation.
    Main Window
    Screenshot
  9. nPOPuk icon

    nPOPuk

    • Windows
    • Windows Mobile
    78 alternatives to nPOPuk 

    nPOPuk is an ultra-small, but comprehensive, e-mail client that runs on a wide range of Windows-based operating systems

     Suggest and vote on features
    Features
    1.  PortablenPOPuk can be used from a USB stick or similar with no prior installation.
    Discontinued

    Not updated since 2017.

    Screenshot
  10. Pegasus Mail icon

    Pegasus Mail

    22 alternatives to Pegasus Mail 

    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.

     Suggest and vote on features
    Features
    1.  LightweightPegasus Mail consumes less device resources compared to similar apps.
    Screenshot taken January,  2018. Fresh install.
    Screenshot of an older Pegasus version
Showing 10 of 20 alternatives
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