Best Email Clients for Fastmail

Find and compare the best Email Clients for Fastmail in 2025

Use the comparison tool below to compare the top Email Clients for Fastmail on the market. You can filter results by user reviews, pricing, features, platform, region, support options, integrations, and more.

  • 1
    Microsoft Outlook Reviews
    Top Pick
    Connect. Organize. Get things done. All your email, calendar, contacts, and tasks in one place. You can manage your email, calendar, contacts and tasks efficiently from one place. Office integration allows you to share attachments directly from OneDrive, access contacts, view LinkedIn profiles, and view LinkedIn profiles. You can book conference rooms and track RSVPs right from your calendar. You can share your calendars to coordinate and plan and see when your coworkers will be available. You can rest assured with enterprise-grade security that is trusted by the world's most important companies. Outlook protects your confidential information around the clock, and doesn't get in your way. Outlook anticipates your needs. Outlook automatically adds travel and bill payments to your calendar. Intelligent reminders help you stay on track. Search makes it easy to find the information you need quickly.
  • 2
    Thunderbird Reviews
    Top Pick
    Thunderbird is an email application that's free and easy to set up. It also has great features! Thunderbird is a free email application that makes email easier for you. It combines speed, privacy, and the most recent technologies. Keep your eyes on the important things and forget about the complexity. Multiple features such as remote content blocking and built-in Do Not Track all work together to protect your privacy and ensure your security. Thunderbird can be customized instantly with Add-ons (Extensions and Themes) and many other features. Thunderbird integrates with your Thunderbird email to allow you to organize your life and schedule. You can manage multiple calendars, add friends to events, and subscribe publicly to calendars. Thunderbird is an open-source project. This means that anyone can contribute ideas and code to the project.
  • 3
    Mailspring Reviews

    Mailspring

    Foundry 376

    $8 per month
    1 Rating
    Mailspring, the best email client for Mac, Linux and Windows, will help you increase productivity and send better emails. Multiple accounts (IMAP & Office 365), touch & gesture support, lightning-fast search and undo send, unified email, read receipts and link tracking and more. Mailspring is available for mac, windows and linux. It also supports themes and layouts (including dark mode), and can be localized into 9 languages. Mailspring indexes all your mail so that you can use advanced Gmail-style search queries to search message contents across all connected accounts. Never lose another email. Understand your audience. Follow-up is essential. Turn clicks and opens into actionable insight. Mailspring Pro is your unstoppable sidekick for sales or business. Mailspring Pro eliminates the limitations of the free version. You can send later, snooze, schedule reminders, and send later unlimited times to conquer your inbox. Connecting with your customers and contacts is key to building trust.
  • 4
    Postbox Reviews

    Postbox

    Postbox

    $49 per user lifetime license
    All your email accounts in a single place, innovative features and easy organization, fast searching, and a beautiful user interface. Postbox will give you email superpowers. It's fast, sleek, and powerful. Organize your email inbox and clear your mind with our features. Pixel-perfect, intuitive user interfaces that behave like real Mac or Windows apps and not webpage experiments. Build your own theme using our powerful Theme Editor, or add a professionally-designed Theme Pack that you can customize any way you like.
  • 5
    Unibox Reviews

    Unibox

    eightloops GmbH

    Unibox is an email client that is people-centric. It organizes your messages according to sender. The left-hand contact list is sorted according to the date of the last email. Each person is only displayed once. You can select a contact to display all messages you have exchanged with them, similar to chat apps or SMS apps for smartphones. You can see all the emails you exchanged with a contact in one list, which allows you to focus on the actual communication. It feels more natural. Unibox allows you to drill down into a thread view if you need to see a specific conversation with multiple participants. Unibox, unlike other email clients, displays attachments as part of the message. It also provides two additional views that contain all files you have exchanged with another person.
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