Sent e-mails don't arrive in sent folder

My e-mail client doesn’t show anything in the sent box, or anything equivalent in my language (Dutch)
I therefore can’t truly tell if a message is sent.
I do see the e-mail appearing and disappearing in the outbox and it works on my thunderbird desktop client.

I use a home e-mail server.

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Which server software?

Yunohost, a server OS based on Debian.