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How to configure Thunderbird ​

This guide explains how to add your Business Email mailbox to Mozilla Thunderbird with manual settings, and how to keep encryption turned on.

Before you begin ​

Settings you need ​

SettingValue
Incoming mail (IMAP)Server mail.apncloud.com, port 993, SSL/TLS
Outgoing mail (SMTP)Server mail.apncloud.com, port 465 with SSL/TLS, or port 587 with STARTTLS
UsernameThe mailbox username shown in the Business Email Panel
PasswordThe password you set for the mailbox

Steps ​

  1. Open Thunderbird and choose Account settings from the menu.
  2. Choose Account actions, then Add mail account.
  3. Enter your name, full email address and password.
  4. Choose Configure manually (or Manual config) if Thunderbird tries to find settings automatically.
  5. Set the incoming server to IMAP: server mail.apncloud.com, port 993, and connection security SSL/TLS.
  6. Set the outgoing server to mail.apncloud.com, port 465 with SSL/TLS, or port 587 with STARTTLS.
  7. Enter the username from the panel, then select Done.
  8. Send a test message to another address you control.

Keep encryption on

Do not set connection security to None, and do not accept an unknown certificate for mail.apncloud.com. If Thunderbird shows a certificate warning, check the server name first.

Two notes on IMAP and SMTP ​

  • IMAP keeps mail on the server, so the same mail appears on your phone and computer.
  • SMTP sends the mail you write. Thunderbird uses it only for outgoing messages.

Expected result ​

Thunderbird shows your Business Email folders, and the test message arrives.

If something goes wrong ​

Last reviewed ​

2026-10-27