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ICS attachments are not being downloaded by Thunderbird

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Thunderbird is not downloading a ICS invite. Email comes through but no attachment. Its on my BT server.

Thunderbird is not downloading a ICS invite. Email comes through but no attachment. Its on my BT server.

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If you have access to the webmail interface for the same account, can you see the attachment online?

Perhaps a filter or antivirus is removing the attachment or modifying incoming email before it reaches Thunderbird.