I am trying to authenticate my domain in Brevo. But my hosting service does not allow underscores for DNS TXT record names. So I cannot add mail._domainkey and _dmarc. As for the Brevo code TXT record, my hosting service didn’t allow @ sign. For that, I just put my domain name, and it worked. I tried to add the domain name for DKIM record and DMARC record names but it didn’t work. Please help!
My domain is registered at domains.lk but my website is hosted in Hostinger. I managed to get it working by pointing the DNS to the Hostinger nameservers and adding the TXT records there. Hostinger allows underscores.