DNS resolution over SSL-VPN routed to IPSEC

[mauros]

Hello. I have an IPSEC configured on my Fortigate with a remote partner. I also have SSL-VPN configured for my users to connect to my Fortigate using Forticlient. I route SSlL-VPN users to the remote partner's servers and they are able to connect using IPs. DNS servers for the SSL-VPN are my internal servers. I want to enable SSL-VPN users to reach partner's server through FQDNs. Which configuration should I change? If I setup a DNS database with the partner's domain and the servers that I need to reach, then how would I say "default DNS for SSL-VPN users are my internal DNS but for that domain use the local defined database"?