Yahoo mail server rejects emails from my exchange group

**Requirements to fill in:**
- Domain name : 91-93-lrmc.co.uk
- Is my hosting/server with OVHcloud? Yes
which offer is it : shared exchange server



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Hello everyone,

My **domain name** is as stated above

And I use the group feature on the shared exchange platform


I have the following problem / I would like to set up :

I created a group called secretary@91-93-lrmc.co.uk
The group has 2 external contacts
One of them is on the yahoo platform (xx@yahoo.co.uk)
When I send an email to the group the yahoo server rejects it without saying why
Does it think it’s spam? Do I need to configure something on my platform so that it gets accepted?
Thanks