Freeradius 3 and strip username

Good afternoon, I use ntlm authorization, but the radius uses for ntlm authorization username@domain.tld as it is written in the authorization to eduroam. It is able to change User-Name variable only for the realm. Strip out @domain.tld ? Thanks and best regards J.Karliak -- Ma domena pouziva zabezpeceni a kontrolu SPF (www.openspf.org) a DomainKeys/DKIM (s ADSP) a implementaci DMARC. Pokud mate problemy s dorucenim emailu, zacnete pouzivat metody overeni puvody emailu zminene vyse. Dekuji. My domain use SPF (www.openspf.org) and DomainKeys/DKIM (with ADSP) policy and implementation of the DMARC. If you've problem with sending emails to me, start using email origin methods mentioned above. Thank you.