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I have unattended-upgrades running on all clients. The notification service is configured via heirloom-mailx and sendmail provided by ssmtp.

Recently, the mails don't show up as text in Thunderbird, but rather as empty mail with a text file attached.

Problem is: Thunderbird thinks it is a binary file and will not display it.

Saving it shows Kubuntu knows it is text.

Where does it all go wrong?

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