The SPF settings for Hyperbola.info domain is incorrectly set.

hyperbola.info descriptive text "v=spf1 include:_mailcust.gandi.net -all"

so your email will not arrive to people:
https://mxtoolbox.com/SuperTool.aspx?ac … n=toolpage

it is allowed only form that gandi.net domain but emails are not sent from that domain, but from IP 185.26.126.154

You need to make your settings correct.