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it sounds like you are using a Claranet domain, not your own?
Seems unlikely that Claranet would not have configured SPF and DKIM for their own domain.
I had to do this for exactly the same reason (Gmail bounces) on a couple of domains I have on Ionos. It's not rocket science, you just have to insert an extra field into the DNS record, although it took a while to work out how to do that and what to put in the field.
gbj_tester
Claranet! I used them last millennium.
There will probably be way to add either SPF or DKIM authentication
In your customer UI. If not, ask their support.
Edit: on rereading, it sounds like you are using a Claranet domain, not your own? In which case they need to sort it out, and have probably misconfigured something.