diff --git a/crates/lance-graph-contract/src/ogar_codebook.rs b/crates/lance-graph-contract/src/ogar_codebook.rs
index 2094926f3..cd15f062d 100644
--- a/crates/lance-graph-contract/src/ogar_codebook.rs
+++ b/crates/lance-graph-contract/src/ogar_codebook.rs
@@ -54,9 +54,6 @@ pub enum ConceptDomain {
     Ontology,
     /// `0x04XX` — Weather / Atmosphere. Shared forecast and atmospheric cells.
     Weather,
-    /// `0x05XX` — Mail (mailbox + message). Mirrors
-    /// `ogar_vocab::ConceptDomain::Mail`.
-    Mail,
     /// `0x07XX` — OSINT (open-source intelligence / Palantir-Gotham).
     Osint,
     /// `0x08XX` — OCR (optical character recognition / document extraction).
@@ -126,7 +123,7 @@ pub enum ConceptDomain {
     /// lifted program references. Mirrors `ogar_vocab::ConceptDomain::Mmio`
     /// (OGAR PR #284, 2026-08-25).
     Mmio,
-    /// Any high-byte slot not yet assigned a domain (`0x06XX`,
+    /// Any high-byte slot not yet assigned a domain (`0x05XX`–`0x06XX`,
     /// `0x10XX`–`0x16XX`, `0x18XX`–`0xBFXX`, `0xC2XX`–`0xC3XX` — a
     /// DELIBERATE gap, pinned like OGAR's own `0x10`–`0x16` — and
     /// `0x90XX` — reference (domain reference tree). HIGH byte = compartment, LOW
@@ -190,7 +187,6 @@ pub fn canonical_concept_domain(id: u16) -> ConceptDomain {
         0x98 => ConceptDomain::Procedure,
         0x9A => ConceptDomain::Form,
         0x04 => ConceptDomain::Weather,
-        0x05 => ConceptDomain::Mail,
         0x07 => ConceptDomain::Osint,
         0x08 => ConceptDomain::Ocr,
         0x09 => ConceptDomain::Health,
@@ -635,9 +631,6 @@ pub const CODEBOOK: &[(&str, u16)] = &[
     // remain ClassView-owned payload structure, not promoted concept rows.
     ("weather_cell", 0x0401),
     ("weather_static_cell", 0x0402),
-    // ── 0x05XX — Mail domain (mailbox + message; spear / stalwart) ──
-    ("mailbox", 0x0501),
-    ("mail_message", 0x0502),
     // ── 0x08XX — OCR domain (document extraction; the Tesseract-rs arc) ──
     // Class-level container KINDS only (the 5+3-hardened mint discipline):
     // the concept slots name the container types the OGAR Core resolves —
@@ -703,6 +696,9 @@ pub const CODEBOOK: &[(&str, u16)] = &[
     ("auth_zitadel", 0x0B02),
     ("auth_zanzibar", 0x0B03),
     ("auth_ory_keto", 0x0B04),
+    // `email` (OGIT `ogit:Email`) in the IAM domain above the AuthStore
+    // profiles; spear plugs it.
+    ("email", 0x0B05),
     // ── 0x0DXX — HR domain (employment / org / contracts; OGAR PR #127) ──
     // Closes the final 4-of-11 cross-axis identity gap surfaced by odoo-rs
     // PR #14: hr.employee / hr.department / hr.job / hr.contract.
@@ -877,8 +873,7 @@ mod tests {
         assert_eq!(canonical_concept_domain(0x0C09), ConceptDomain::Automation);
         assert_eq!(canonical_concept_domain(0x0D01), ConceptDomain::HR);
         assert_eq!(canonical_concept_domain(0x0D04), ConceptDomain::HR);
-        assert_eq!(canonical_concept_domain(0x0500), ConceptDomain::Mail);
-        assert_eq!(canonical_concept_domain(0x0600), ConceptDomain::Unassigned);
+        assert_eq!(canonical_concept_domain(0x0500), ConceptDomain::Unassigned);
         assert_eq!(canonical_concept_domain(0x0E00), ConceptDomain::Genetics);
         assert_eq!(canonical_concept_domain(0x0F00), ConceptDomain::Geo);
         assert_eq!(canonical_concept_domain(0x0300), ConceptDomain::Ontology);
@@ -960,8 +955,7 @@ mod tests {
         assert_eq!(canonical_concept_id("currency_policy"), Some(0x0206));
         assert_eq!(canonical_concept_id("weather_cell"), Some(0x0401));
         assert_eq!(canonical_concept_id("weather_static_cell"), Some(0x0402));
-        assert_eq!(canonical_concept_id("mailbox"), Some(0x0501));
-        assert_eq!(canonical_concept_id("mail_message"), Some(0x0502));
+        assert_eq!(canonical_concept_id("email"), Some(0x0B05));
         assert_eq!(canonical_concept_id("unicharset"), Some(0x0801));
         assert_eq!(canonical_concept_id("charset"), Some(0x0803));
         assert_eq!(canonical_concept_id("patient"), Some(0x0901));