How to configure your OpenXchange Email Account using Mozilla Thunderbird

In order to send and receive email using Mozilla Thunderbird, you need to setup your account as described below –

1. Start Thunderbird, go to the File menu and click New -> Account

2. In the Account Wizard dialog box, select Email account and then click Next

3. Enter your name as you would like it to appear for any mail that you send, and your complete email address (

4. Select the type of incoming server you are using as either POP / IMAP.

5. Incoming & Outgoing mail server: You can obtain this information from your Email Dashboard. In Dashboard go to Mail > DNS Configuration and POP/IMAP/SMTP records. Or if you are using our DNS service for your domain then you can use:

Account Type: POP

Incoming Mail Server: pop.your-domain-name (eg:

Outgoing Mail Server: smtp.your-domain-name (eg:

Account Type: IMAP

Incoming Mail Server: imap.your-domain-name (eg:

Outgoing Mail Server: smtp.your-domain-name (eg:

Enter the Incoming Mail Server name and the Outgoing Server name in the corresponding boxes and click Next.

6. Enter your full email address as the Incoming User Name and your Outgoing User Name and click Next

7. In the Account Name box, you can enter any name that would help you identify this mailbox and click Next.

8. Verify your account information and click Finish.


Usually, the port used for the Outgoing Mail Server/SMTP Service is 25. However, there might be a situation where your ISP might be blocking the use of port 25 for SMTP service. Many ISPs block port 25 in order to minimize the amount of spam sent using their network. If you are facing issues sending mails using the default port 25, you can confirm with your ISP whether port 25 is indeed blocked by them.

To circumvent this, you can use an alternate port 587 for sending mails if port 25 is blocked. Here’s how:

a) In Mozilla Thunderbird, on the Tools menu, click Account Settings

b) Click on Outgoing Server (SMTP). In the Outgoing Server (SMTP) Settings section as seen in the below image, select entry for your domain name and click Edit

c) Replace the default port number 25 with the alternate port number 587

d) Click OK in the SMTP Server and Account Settings windows to save the changes


SSL/TLS option has been enabled on our servers. The SSL/TLS option will run on the default ports. That means, you do not need to change the port numbers for the SSL/TLS option to work.

Steps to configure TLS/SSL in Mozilla Thunderbird:

a) Start Mozilla Thunderbird program.

b) From the Tools menu, choose Account Settings and select your email account from the list.

c) Select Server Settings from the folder list below your email account and verify the Server Ports for IMAP is 993 and for POP is 995.

d) Under Security Settings select SSL/TLS for the Connection security.

e) Click OK.

For information on updating Mozilla Thunderbird, see Mozilla Messaging Support.

Thats it, your account has been setup! When you click on Get Mail, all your email will be downloaded by Thunderbird.