On this help page, we'll point you to all of the help pages we offer to guide you through setting up your Fastmail account on popular mail clients and apps.
For the best experience with Fastmail, we recommend using our web interface, the Fastmail desktop app, or the Fastmail mobile app.
Users on a Basic plan will not be able to use Fastmail on third-party mail clients or create app passwords, as Basic plans do not include access to IMAP, SMTP, CalDAV, or CardDAV. If you are on a Basic plan, you can still use Fastmail on any device via a web browser or the Fastmail app.
Note: Every external program or app needs its own app password to access your information. If you use your normal password or your two-step verification password, you will see a password error.
Desktop
Mac Mail
- Automatic setup on Mac
- Manual setup of Mail and Notes on Mac
- Manual setup of Calendar on Mac
- Manual setup of Contacts on Mac
Windows Mail
Other mail clients
- How to set up Thunderbird
- How to set up Outlook
- How to set up Outlook for macOS
- Set up eM Client
- How to set up MailMate
- Set up Vivaldi Mail
- How to set up The Bat!
Mobile app
If you have an iPhone, iPad, or Android device, we recommend the Fastmail mobile app.
If you would like to use your device's native mail app, help pages related to your device are listed below.
Android
Our Android-related help pages are listed below:
- Setting up Fastmail on Android
- Setting up Gmail on Android
- Setting up Samsung Email
- Setting up K-9 Mail
iOS
Our iOS setup guides, based on the iOS version you're running, are below:
- iOS devices: iOS 26
- iOS devices: iOS 18
- iOS devices: iOS 17
- iOS devices: iOS 16 and 15
- iOS devices: iOS 14
- iOS devices: iOS 12 and 13
We also offer some additional help pages to assist with setup on iOS:
- Set up iOS devices manually
- iOS: Adding additional email addresses
- Making Fastmail the default mail app in iOS
- Known issues with Apple apps and clients
Other third-party apps and clients not listed
If the app you want to use is not listed above, please check the app's technical documentation or contact their support team for instructions on how to set up an IMAP/CalDAV/CardDAV account.
You may need the information on our Server names and ports page if the app is unable to discover the correct settings automatically.
Our support team is unable to offer in-depth technical assistance with other third-party apps/clients. If this is needed, please contact the app/client's support team directly.
Troubleshooting
If you're experiencing an issue with your mail client, please see our Troubleshooting mail client issues help page for guidance on troubleshooting.