TIL: Email addresses are case-sensitive

2026-05-02

• #en
• #email
• #til

No, the local part of an email address is case-sensitive. ASCII domain names are case-insensitive; unicode internationalized domain names are case-sensitive.

https://lobste.rs/s/otzxqs/things_you_didn_t_know_about_indexes#c_39aiy6