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However, if a different account requires IPv6 it will cause an issue with that account.Īlternative if the above does not work or you do not want to globally disable IPv6 for Thunderbird: NOTE: This configuration setting is global for all accounts configured in Thunderbird and is effective for Exchange Online, Office 365.

The first option should be 6 - select this and toggle to change it from false to true.

In the search Find in Settings box, type - press Enter.

Then go to General -> Config Editor -> Show All

In Thunderbird, click on the Settings option in the program's main drop-down menu.Thunderbird email client is not sending email with Exchange Online - typically after an upgrade to Thunderbird client.