Thunderbird Configuratin for SMTPS Service

This section provides a tutorial example on how to configure Thunderbird use SMTPS (SMTP with SSL/TLS) service to securely sending out new emails.

If you are concerned about sending emails as clear text to the remote SMTP service, you can change Thunderbird configuration to use SMTPS (SMTP with SSL/TLS) service provided by Postfix.

For example, my Postfix is configured to support the following:

So here is what I did to change Thunderbird configuration with above server setting.

1. On my email server, make sure that Postfix listening on the given port.

herong$ nmap -T4

465/tcp  open  smtps

2. On my email server, make sure that the firewall is open for those ports.

herong$ sudo firewall-cmd --zone=public --list-all

public (active)
  services: cockpit dhcpv6-client ftp http imap pop3 pop3s smtp smtps ssh

3. Now launch Thunderbird on the other computer.

4. Click "Tools > Account Settings" menu. You see the "Account Settings" tab open.

5. Click "Outgoing Server (SMTP)" on the left. You see the "Outgoing Server (SMTP) Settings" open.

6. Click on the "". You see the current SMTP server setting.

7. Make the following changes:

  Description:    SMTP with SSL/TLS
  Server name:
  Port:           465

Security and Authentication
  Connection security:   SSL/TLS
  Authentication method: Normal password

8. Click "OK" to save changes.

Thunderbird Configuration for SMTPS Service
Thunderbird Configuration for SMTPS Service

Test it by sending a new email. If you see a certificate exception, click "Confirm Security Exception" to accept it.

Congratulations! Your Thunderbird is securely sending and receiving emails now.

Table of Contents

 About This Book

 Introduction to Linux Systems

 Cockpit - Web Portal for Administrator

 Process Management

 Files and Directories

 Users and Groups

 File Systems

 Block Devices and Partitions

 LVM (Logical Volume Manager)

 Installing CentOS

 SELinux - Security-Enhanced Linux

 Network Connection on CentOS

 Internet Networking Tools

 SSH Protocol and ssh/scp Commands

 Software Package Manager on CentOS - DNF and YUM

 vsftpd - Very Secure FTP Daemon

 Postfix - Mail Transport Agent (MTA)

 Dovecot - IMAP and POP3 Server

Email Client Tools - Mail User Agents (MUA)

 "mailx" Command - Send and Read Emails

 "Alpine" - Terminal-Based Email Client

 Thunderbird Installation on macOS

 Thunderbird Configuration for POP3S and SMTP

 Thunderbird to Accept POP3S Certificate Exception

 Thunderbird Configuration for IMAPS and SMTP

Thunderbird Configuratin for SMTPS Service

 macOS Mail Auto Configuration

 macOS Mail Manual Configuration

 Accept Certificate Exception in macOS Mail

 Windows 10 Mail Configuration Failed

 SSL/TLS Connection Issue in Windows 10 Mail

 LDAP (Lightweight Directory Access Protocol)

 Administrative Tasks


 Full Version in PDF/EPUB