Quick answer
Configure Thunderbird with the mailbox provider's supported TLS settings. The old lesson's unencrypted or default-port choices are not current recommendations.
Applies to
For an authorized mailbox user. Interactive Online manages settings only for mail hosted on the selected service; mail hosted elsewhere uses that provider's settings. The preserved lesson shows an earlier interface.
Steps
- Open the intended application or account and confirm its complete mailbox address and provider.
- Use Thunderbird Account Settings > Server Settings for incoming mail and the assigned Outgoing Server (SMTP) entry for sending. Use the exact provider hostname and matching encryption/port pair; choose the provider-assigned ports rather than changing the number alone.
Check the result
Confirm the intended account state and test two-way mail when the account remains configured. Preserve access to local-only messages.
Troubleshooting and support
For a certificate mismatch or authentication failure, confirm the exact host and identity. Do not disable certificate validation or recreate an account before protecting its local data.
Contact support from the owning account with the domain, product/version, exact error, time/time zone and redacted evidence. Exclude credentials, session URLs, payment details and private customer records. Confirm any separate application-support scope.
Original historical tutorial
The original tutorial link and any earlier written lesson are preserved below as historical material. They show an earlier interface and may depend on an old player. Use the current written guidance above and its references when labels or capabilities differ; the old interface does not establish current hosting availability.
Related help
- Configuring a POP email account with SSL in Thunderbird
- Configuring an IMAP email account with SSL in Thunderbird
Official references
Written guidance reviewed November 1, 2026. The preserved historical tutorial has not been recertified for current software.
