Step 1.

Click Thunderbird in the top left and then Preferences.

Step 2.

Click on Account Settings.

Step 3.

Click on Server Settings under your mailbox and change the following:

• Server name: imap.rebel.com
• Port: 993
• Connection security: SSL/TLS

Step 4.

Click on Outgoing Server (SMTP) at the bottom of the list.

Step 5.

Find the mail server for securemail.rebel.com* that you’re using for your email address and click Edit.

*your mail server might say mail.yourdomain.com (ie, if your domain is example.com your mail server might be mail.example.com)

Step 6. 

Change the following and then click Ok:

• Server name: smtp.rebel.com
• Port: 587
• Connection Security: STARTTLS

Step 7.

Click Ok.