Error when sending an attachment from chatmail server via Thunderbird

Hi! Can you tell me why some chatmail servers (like mehl.cloud, chatmail.woodpeckersnest.space, d.gaufr.es and chat.privittytech.com) are not sending attachments via Thunderbird? nine.testrun.org, mailchat.pl, chika.aangat.lahat.computer, chtml.ca, chatmail.au and e2ee.wang do not have this problem.

Could be they are not updated to the latest version, e.g. do not include

or some other similar fix.

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It’s possible. Sorry for the newbie question, but could you please tell me how I can update my chatmail server to the latest version?

You can git pull in the checked out repository to update your chatmail/relay clone to the latest version, then redeploy it with cmdeploy as when setting it up for the first time.

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Thank you so much! The update was successful, everything works now.