Apps with 'S/MIME Support' feature

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Thunderbird
Free • Open Source
Email Client
Calendar App
Mac
Windows
Linux
BSD
AppImageHub
Snapcraft
Flathub
PortableApps.com
Haiku
Homebrew
Chocolatey
93 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.
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Thunderbird 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. Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Thunderbird.
7. PortableThunderbird can be used from a USB stick or similar with no prior installation.
8. Support for ThemesYou can use themes and templates to change the look and feel of Thunderbird.
9. Integrated Password ManagerThunderbird lets you access all the passwords you’ve saved across your different devices.
Extensible by Plugins/Extensions
Multiple Account support
IMAP Support
Calendar Integration
SMTP Support
FOSS
Email Organizer
Built-in RSS reader
Add-ons
Intuitive
Top 3 alternatives
Microsoft Office Outlook
Paid • Proprietary
Email Client
Calendar App
Mac
Windows
Online
Android
iPhone
Android Tablet
Windows Phone
iPad
Apple Watch
Android Wear
135 alternatives to Microsoft Office Outlook
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.
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Microsoft Office Outlook 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. Calendar ViewMicrosoft Office Outlook has a built-in calendar view to have a clear overview of your content over time.
4. Support for AliasesMicrosoft Office Outlook supports aliases, so you can receive email without exposing your main email address
5. Unified inboxView e-mails (or similar) from all accounts in one unified view with Microsoft Office Outlook.
6. Multiple Account supportMicrosoft Office Outlook support multiple accounts without the need to logout and login
7. Works OfflineMicrosoft Office Outlook can be used without the need to connect to the internet.
8. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
9. Dark ModeMicrosoft Office Outlook supports dark mode for comfortable usage in low light conditions.
Exchange
Native application
Email Organizer
Onenote Desktop Integration
Contacts
Built-in Calendar
Calendar Integration
Address book integration
Calendar View
Support for Aliases
Top 3 alternatives
FairEmail
Freemium • Open Source
Email Client
Android
Android Tablet
F-Droid
45 alternatives to FairEmail
FairEmail is a privacy-focused email client with a setup wizard that helpfully walks you through the steps to use it with any email provider. There are many privacy settings including encryption via OpenPGP and S/MIME and reformatted emails to avoid phishing.
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FairEmail Features
1. Privacy focusedFairEmail is considered a privacy friendly alternative.
2. Multiple Account supportFairEmail support multiple accounts without the need to logout and login
3. PGP EncryptionFairEmail supports PGP, an encryption system used for sending encrypted emails and files.
4. Works OfflineFairEmail can be used without the need to connect to the internet.
5. Block TrackersFairEmail has a feature to block trackers from tracking you.
6. No TrackingFairEmail will not track you or use your personal data.
7. Calendar IntegrationFairEmail lets you sync your tasks and events with your calendar application.
Privacy focused
Multiple Account support
Customizable
PGP Encryption
Email notifications
Extensive settings menu
IMAP Support
Notifications
S/MIME Support
Works Offline
Top 3 alternatives
Postbox
Paid • Proprietary
Email Client
Mac
Windows
70 alternatives to Postbox
Postbox is an email application that helps you organize your work life and get stuff done.
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Postbox Features
1. Multiple Account supportPostbox support multiple accounts without the need to logout and login
2. Extensible by Plugins/ExtensionsPostbox can be extended with add-ons, plugins and extensions.
Multiple Account support
Exchange
Box.com integration
Tabbed interface
Dropbox integration
IMAP Support
Built-in RSS reader
S/MIME Support
Multiple languages
Onedrive integration
Top 3 alternatives
eM Client
Freemium • Proprietary
Email Client
Calendar App
Mac
Windows
64 alternatives to eM Client
eM Client is a full featured e-mail client with a modern and easy to use interface. eM Client also offers calendar, tasks, contacts, notes and chat.
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eM Client Features
1. Calendar IntegrationeM Client lets you sync your tasks and events with your calendar application.
2. Multiple Account supporteM Client support multiple accounts without the need to logout and login
3. PGP EncryptioneM Client supports PGP, an encryption system used for sending encrypted emails and files.
4. Dark ModeeM Client supports dark mode for comfortable usage in low light conditions.
5. Unified inboxView e-mails (or similar) from all accounts in one unified view with eM Client.
6. Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
7. Email OrganizereM Client allows you to take control of your inbox by filtering and control tools.
8. Sync with Google CalendareM Client can be synchronized with Google Calendar
9. Automatic BackupeM Client will automatically back up your data periodically.
IMAP Support
Calendar Integration
Multiple Account support
PGP Encryption
Exchange
CardDAV Support
Dark Mode
CalDAV Support
Contacts
Gmail integration
Top 3 alternatives
Mutt
Free • Open Source
Email Client
Mac
Windows
Linux
Xfce
55 alternatives to Mutt
Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various features to support mailing lists, including...
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Mutt Features
1. PGP EncryptionMutt supports PGP, an encryption system used for sending encrypted emails and files.
2. Command line interfaceMutt either have CLI support or is a CLI-only app.
Tui
Console-based
Text-based
IMAP Support
PGP Encryption
Command line interface
POP3 Support
S/MIME Support
Top 3 alternatives
Nitrokey
Free • Open Source
Mac
Windows
Linux
11 alternatives to Nitrokey
Nitrokey is an USB key to enable highly secure encryption and signing of emails and data, as well as login to the Web, networks and computers. Other than ordinary software solutions, the secret keys are always stored securely inside the Nitrokey.
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Nitrokey Features
1. Two-factor AuthenticationNitrokey supports two-factor authentication (2FA).
2. Time-based One-time PasswordNitrokey has support for TOTP, a computer algorithm that generates Time-based One-Time Passwords
3. PGP EncryptionNitrokey supports PGP, an encryption system used for sending encrypted emails and files.
4. OpenPGPNitrokey supports OpenPGP, a standard of PGP encryption that is open-source for public use.
Two-factor Authentication
HMAC-Based One-Time Password (HOTP)
Time-based One-time Password
Hardware securite module (HSM)
PGP Encryption
Password safe
OpenPGP
S/MIME Support
Add a screenshot
Top 3 alternatives
Kopano
Paid • Open Source
Mail Server
Email Client
Mobile Device Management (MDM) Tool
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
Windows Phone
iPad
Self-Hosted
Microsoft Office Outlook
S/MIME
Software as a Service (SaaS)
25 alternatives to Kopano
Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface.
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Kopano Features
1. Real time collaborationMultiple users can work together in Kopano simultaneously.
On-premises software
Shared Calendar
Real time collaboration
IMAP Support
CalDAV Support
S/MIME Support
POP3 Support
Top 3 alternatives
Interlink Mail & News
Free • Open Source
Email Client
Windows
Linux
11 alternatives to Interlink Mail & News
Interlink Mail & News is a free e-mail client based on open source community code built on the Unified XUL Platform. It is available for Microsoft Windows and Linux (with other operating systems in development).
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Interlink Mail & News Features
1. Multiple Account supportInterlink Mail & News support multiple accounts without the need to logout and login
2. Integrated Password ManagerInterlink Mail & News lets you access all the passwords you’ve saved across your different devices.
3. Extensible by Plugins/ExtensionsInterlink Mail & News can be extended with add-ons, plugins and extensions.
4. Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Interlink Mail & News.
5. Support for ThemesYou can use themes and templates to change the look and feel of Interlink Mail & News.
SMTP Support
HTML Compose
IMAP Support
Multiple Account support
Legacy addons support
Integrated Password Manager
POP3 Support
Extensible by Plugins/Extensions
Integrated Web Browser
Import/Export OPML Feeds
Top 3 alternatives
The Bat
Paid • Proprietary
Email Client
Windows
S/MIME
OpenPGP
60 alternatives to The Bat
The Bat! is a secure email client software, built to protect your correspondence against third-parties.
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The Bat 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.
PGP Encryption
Support for scripting
GPG Encryption
Built-in RSS reader
POP3 Support
IMAP Support
S/MIME Support
Portable
SMTP Support
Top 3 alternatives
Becky! Internet Mail
Paid • Proprietary
Email Client
Windows
S/MIME
OpenPGP
24 alternatives to Becky! Internet Mail
Becky! Internet Mail is an email client for Windows OS. Becky! Internet Mail supports POP3, IMAP and S/MIME as well as OpenPGP via add-ons.
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Becky! Internet Mail Features
1. PGP EncryptionBecky! Internet Mail supports PGP, an encryption system used for sending encrypted emails and files.
2. GPG EncryptionBecky! Internet Mail supports GPG (aka GnuPG) for encryption of things like emails, messages, files, etc.
3. PortableBecky! Internet Mail can be used from a USB stick or similar with no prior installation.
POP3 Support
SMTP Support
IMAP Support
S/MIME Support
PGP Encryption
GPG Encryption
Portable
Top 3 alternatives
CAcert
Free • Proprietary
Online
19 alternatives to CAcert
CAcert.org is a community-driven Certificate Authority that issues certificates to the public at large for free.
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CAcert Features
1. GPG EncryptionCAcert supports GPG (aka GnuPG) for encryption of things like emails, messages, files, etc.
2. PGP EncryptionCAcert supports PGP, an encryption system used for sending encrypted emails and files.
GPG Encryption
SSL
Certification
Encrypted Email
PGP Encryption
S/MIME Support
Warning
CAcert can't be trusted: It has serious code vulnerabilities, the coding style is very bad & they failed an organizational-practices audit which all other major certificate authorities have passed. Almost no browsers or operating systems support CAcert, so any website using the certificate will trigger a big untrusted connection/certificate warning that will drive most visitors away. https://tinyurl.com/cacert-got-what-you-paid-for | https://www.reddit.com/r/technology/comments/1qj1tz/http_20_to_be_https_only/cddfmz0
Add a screenshot
Top 3 alternatives
Amazon SES (Simple Email Service)
Freemium • Proprietary
Email Client
Online
33 alternatives to Amazon SES (Simple Email Service)
Amazon Simple Email Service (Amazon SES) is a cost-effective outbound-only email-sending service built on the reliable and scalable infrastructure that Amazon.com has developed to serve its own customer base.
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Amazon SES (Simple Email Service) Features
1. Email template editorAmazon SES (Simple Email Service) offers pre-defined email layouts so you can add content or customize your own templates.
2. Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Amazon SES (Simple Email Service).
3. Extensible by Plugins/ExtensionsAmazon SES (Simple Email Service) can be extended with add-ons, plugins and extensions.
Email template editor
Email api
S/MIME Support
Tabbed interface
Import/Export OPML Feeds
IMAP Support
Extensible by Plugins/Extensions
Built-in RSS reader
Add a screenshot
Top 3 alternatives
MeSign
Free • Proprietary
Email Client
Windows
Android
iPhone
22 alternatives to MeSign
MeSign is a free email encrypted client. Once you log in to your email account with MeSign App, the free S/MIME certificates will be issued, installed and configured automatically. The users can start to encrypt within 3 minutes.
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MeSign Features
1. End-to-End EncryptionMeSign has E2E Encryption, for entire or parts of the app.
Encrypted Email
End-to-End Encryption
S/MIME Support
Private messaging
Top 3 alternatives
MailDroid
Paid • Proprietary
Email Client
Android
S/MIME
OpenPGP
3 alternatives to MailDroid
Need a great working email client on Android? MailDroid is the one you should download! Has the power of Outlook and Thunderbird for your Android device.
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MailDroid Features
1. PGP EncryptionMailDroid supports PGP, an encryption system used for sending encrypted emails and files.
POP3 Support
PGP Encryption
S/MIME Support
Top 3 alternatives

Thunderbird Features

Top 3 alternatives

Microsoft Office Outlook Features

Top 3 alternatives

FairEmail Features

Top 3 alternatives

Postbox Features

Top 3 alternatives

eM Client Features

Top 3 alternatives

Mutt Features

Top 3 alternatives

Nitrokey Features

Top 3 alternatives

Kopano Features

Top 3 alternatives

Interlink Mail & News Features

Top 3 alternatives

The Bat Features

Top 3 alternatives

Becky! Internet Mail Features

Top 3 alternatives

CAcert Features

Top 3 alternatives

Amazon SES (Simple Email Service) Features

Top 3 alternatives

MeSign Features

Top 3 alternatives

MailDroid Features

Top 3 alternatives