https://intgovforum.org/en/content/igf-2024-ws-150-language-and-inclusion-multilingual-names
"The Internet must be multilingual to be inclusive. This means the domain names and email addresses we use to navigate and communicate online must also be multilingual – called internationalized domain names (IDNs) and email addresses. In 2005 the WSIS Tunis Agenda committed to the "multilingualization of the Internet", noting the importance of implementing multilingualism in domain names and email addresses.

ICANN's global multistakeholder community has deployed 150 top-level domains (TLDs) in 37 languages in 23 scripts. Today we see internationalized domain names, e.g. Thai ยูเอทดสอบ.ไทย, and email addresses, e.g. Japanese めーるてすと@どこでもつかえる.みんな."

"Despite progress, Universal Acceptance (UA) of domain names and email addresses by Internet applications and services remains a challenge. For example, Arabic email addresses cannot be used to register for a social media application. Less than 10% of popular national or global websites and 23% of deployed email servers are configured to accept email addresses in all local languages, according to ICANN community studies."