Choose a different device or app
Desktop
Thunderbird on a computer
Use these steps if you use Thunderbird on Windows, Mac or Linux.
Step by step
Follow these steps
Start adding an account
Open Thunderbird. Click the three-line menu, then Add Account, then Email. If this is your first account, the setup screen may already be open.
Enter your name and email
Type your name and your full business email address. Click Continue.
Check the settings Thunderbird finds
If it cannot find the account, choose the option to configure it manually. For the account type, choose IMAP.
Fill in the incoming settings
Use fusion.mxrouting.net, port 993 and SSL/TLS. Use your full email address as the username.
fusion.mxrouting.net993SSL/TLSFill in the outgoing settings
Use the same server name, fusion.mxrouting.net, port 465 and SSL/TLS. Use your full email address as the username here too.
fusion.mxrouting.net465SSL/TLSEnter your email password
Choose Normal password if asked how to sign in. Enter your email password when prompted. Do not choose Google or Microsoft sign-in for this account.
Finish and check your inbox
Complete the remaining prompts. Send an email to another account you can open, then reply to check that mail arrives.
Email settings to copy
Use these exact details
Keep this open while you fill in your email app. Select any value yourself if copying does not work.
fusion.mxrouting.net993SSL/TLS465https://fusion.mxrouting.net/roundcube/- Username
- Your complete email address
- Password
- Your email password
- Outgoing sign-in
- Required
Do not enter or save a password on this guide website.
Helpful notes
Keep in mind
Thunderbird 140 ESR and older interfaces
Versions before 150 use the previous account wizard. Use Mozilla’s legacy manual-configuration guide linked below if that is what you have installed; its screenshots do not represent Account Hub.
About this guide
Version: Thunderbird 150+ · Account Hub
Documentation checked: September 18, 2026
Method: Official documentation reviewed
Sources