pub const MAX_USER_LENGTH: usize = 64;
pub const MAX_DOMAIN_LENGTH: usize = 255;
pub const MAX_LABEL_LENGTH: usize = 63;
pub const MIN_EMAIL_LENGTH: usize = 3;
pub const MAX_EMAIL_LENGTH: usize = 320;
pub const SIMD_CHUNK_SIZE: usize = 32;
pub const ASCII_MASK: u64 = 0x8080808080808080;