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Thunderbird Events - Organizer has default domain of @internal

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When I create a new event by right-clicking on a day on the monthly calendar and then "Invite Attendees" I see in the new pop-up dialog that the organizer of the event has the illegal domain address of "@internal". The attendees receive their invitations but the .ics contains the line

ORGANIZER;PARTSTAT=NEEDS-ACTION;CUTYPE=INDIVIDUAL;SENT-BY="mailto:

<redacted>":mailto:<redacted>@internal

Since <redacted>@internal is an illegal email address the attendee cannot respond to the invitation either in the affirmative or negative.

How can I change the default domain of the organizer to the email address of the user creating the event? I have searched through all the settings I can find no mention of @internal there or in the documentation on the web.

I have been testing on my Win 8.1 system and Thunderbird 115.16.2 (32-bit), which is the most advanced available. The people I work with experience the same behavior with Thunderbird 128.3.0 on Win 10 and Win 11.

When I create a new event by right-clicking on a day on the monthly calendar and then "Invite Attendees" I see in the new pop-up dialog that the organizer of the event has the illegal domain address of "@internal". The attendees receive their invitations but the .ics contains the line ORGANIZER;PARTSTAT=NEEDS-ACTION;CUTYPE=INDIVIDUAL;SENT-BY="mailto: <redacted>":mailto:<redacted>@internal Since <redacted>@internal is an illegal email address the attendee cannot respond to the invitation either in the affirmative or negative. How can I change the default domain of the organizer to the email address of the user creating the event? I have searched through all the settings I can find no mention of @internal there or in the documentation on the web. I have been testing on my Win 8.1 system and Thunderbird 115.16.2 (32-bit), which is the most advanced available. The people I work with experience the same behavior with Thunderbird 128.3.0 on Win 10 and Win 11.

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