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Set up Mozilla Thunderbird

Add your mailbox to Thunderbird using IMAP and SMTP.

2 min read Updated October 5, 2026

This guide adds your mailbox to Mozilla Thunderbird using IMAP for incoming mail and SMTP for outgoing mail.

Before you start

You need three things:

What Where to find it
Mail server name mailXXX.mailasp.net — in the Control Panel go to E-mails, click Manage next to your domain and read the Server field on the Overview page.
Username The full e-mail address of the mailbox, for example info@yourdomain.com.
Password The password of the mailbox.

Add the account

  1. Open the account setup

    Start Mozilla Thunderbird. On the first start the e-mail account setup wizard opens automatically. Otherwise open it from ☰ Menu → Account Settings → Add Account → Existing Email Account.

  2. Enter your account details

    Fill in the form and click Continue:

    Field Value
    Your Name The name recipients will see, for example John Doe
    Email Address info@yourdomain.com
    Password The password of the mailbox
    Remember Password Ticked

  3. Enter the server settings

    Set the incoming and outgoing server manually:

    Server Port Encryption method Authentication method
    Incoming mail (IMAP) mailXXX.mailasp.net 993 SSL/TLS Normal password
    Outgoing mail (SMTP) mailXXX.mailasp.net 465 SSL/TLS Normal password

    Replace mailXXX with the server name from the Control Panel.

  4. Verify the settings

    Click Re-test. If everything is correct, click Done and the account is added.

Test the account

  • Send a test e-mail to check that outgoing mail works.
  • Send a message to the mailbox from another address to check that incoming mail arrives.

Troubleshooting

If Thunderbird cannot connect, check the server settings again. Then try to sign in to WebMail with the same e-mail address and password — this tells you whether the address and password are correct.

Tip

Besides SSL/TLS on ports 993 and 465, the mail server also accepts STARTTLS on ports 143 (IMAP) and 587 (SMTP). See IMAP, POP3 and SMTP settings.

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