Office365 – Email Connectivity Testing through Mozilla Thunderbird


Earlier this weekend got an email that analysts were no longer receiving emails that we had subscribed them to via Microsoft Reporting Services.


Log Files

Checked the various log files ( Reporting Services, IIS SMTP).

BTW, we are using IIS SMTP as a Smarthost Relay.

The logs were not illuminating.


Mozilla Thunderbird

Tried the same configuration with slight variations.  Actually many more times than I can remember.  And, definitely much more than I will admit.



That chick named Google is your friend and so looked for how to configure email clients to use Office 365.

Found some good leads, but nothing worked out.



Here is the process we undertook to configure Mozilla Thunderbird to use Microsoft Office 365.

  1. Launch Mozilla Thunderbird
  2. Choose the Account
    • Right click on the Account you have selected
    • And, from the dropdown menu, choose “Settings
  3. Account Settings
    • The “Account Settings” window appears
    • At the bottom of the “Account Settings” window we will observe the “Account Actions” panel
    • One of the choices available in the “Account Actions” panel is the “Add Mail Account” option
    • Please choose the “Add Mail Account” option
  4. “Mail Account” Setup
    • The “Mail Account Setup” window appears
    • Initial Screen
      • It is prefilled with your current system’s full name
      • Please enter your full email address
      • And, password
      • Once entered, please press the Continue button
    • Suggested Configuration
      • Based on the email address entered, Mozilla retrieves the domain name
      • The registered DNS Provider for the domain name is contacted
      • And, asked for MX record
      • Using the MX record, the servers registered for Mail are then contacted
      • If the Mail providers are able to provide mail registration data, communication is started with them
    • Manual Configuration
      • Please click on the manual config button to review or adjust configuration data


Mail Account Setup
Access Account Configuration

Account Settings

Account Settings

Mail Account Setup – 01

Mail Account Setup – 02

Mail Account Setup – Looking up Configuration – Email Provider

Mail Account Setup – Looking up Configuration – Email Provider – Configuration found in Mozilla ISP database

Mail Account Setup – Manual Configuration

Configuration Results

Flow Protocol Server hostname Port SSL Authentication
Incoming IMAP 993 SSL/TLS Normal password
Outgoing SMTP 587 STARTTLS Normal password


Network Monitoring

Microsoft Network Monitor

Once we were satisfied that we were able to establish communication between our host and the Mail Server, we used Microsoft Network Monitor to review the traffic.

Here is the filters we employed and what we captured via “Microsoft Network Monitor“.





Network Conversations



  1. Microsoft
    • Technet
      • Network Monitor Conversation Filtering


A good solution was so far away until we discovered that Mozilla Thunderbird is able to communicate with the Provider and request configuration data.

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