diff --git a/bun.lock b/bun.lock
index 5d0430e..ee1e0bb 100644
--- a/bun.lock
+++ b/bun.lock
@@ -12,7 +12,7 @@
       },
       "devDependencies": {
         "@convex-dev/auth": "0.0.95",
-        "@hraness/relay": "github:hraness/relay#2558a0d860d35ec2537cc135380ea4bd89db1c8f",
+        "@hraness/relay": "github:hraness/relay#5ef01b0613ac49c4da0fcb8d2ee81e667c592992",
         "@types/bun": "1.4.2",
         "@types/node": "26.6.2",
         "convex": "1.45.0",
@@ -105,7 +105,7 @@
 
     "@hono/node-server": ["@hono/node-server@2.1.1", "", { "peerDependencies": { "hono": "^4" } }, "sha512-ELuehkj5VCBdgEw9zs+ivkKwyzzUCSQuE96YmiPvn1ECBoZCczbFXJLeEGMTYjphP6gydh4pHMqEYPVMYUVgQg=="],
 
-    "@hraness/relay": ["@hraness/relay@github:hraness/relay#2558a0d", { "dependencies": { "@convex-dev/auth": "0.0.95" }, "peerDependencies": { "convex": ">=1.44.0" } }, "hraness-relay-2558a0d", "sha512-p7Rcth6p8m9WbW5IZzCP0jBEa6Ies3347zBUOfqvbp+fZseuEn/mRyqh0/2dUdntSkK6XxRcR4sZwD1lQhROXw=="],
+    "@hraness/relay": ["@hraness/relay@github:hraness/relay#5ef01b0", { "dependencies": { "@convex-dev/auth": "0.0.95" }, "peerDependencies": { "convex": ">=1.44.0" } }, "hraness-relay-5ef01b0", "sha512-nYnKFBdq3MpFceto71UwjPNEULS/aY5T9GLgpkj0GCaxRAkqRwysXFnipACwstr6kSKFMFjdDfkgYesAKVnLxw=="],
 
     "@modelcontextprotocol/sdk": ["@modelcontextprotocol/sdk@1.30.0", "", { "dependencies": { "@hono/node-server": "^1.19.9 || ^2.0.5", "ajv": "^8.17.1", "ajv-formats": "^3.0.1", "content-type": "^1.0.5", "cors": "^2.8.5", "cross-spawn": "^7.0.5", "eventsource": "^3.0.2", "eventsource-parser": "^3.0.0", "express": "^5.2.1", "express-rate-limit": "^8.2.1", "hono": "^4.11.4", "jose": "^6.1.3", "json-schema-typed": "^8.0.2", "pkce-challenge": "^5.0.0", "raw-body": "^3.0.0", "zod": "^3.25 || ^4.0", "zod-to-json-schema": "^3.25.1" }, "peerDependencies": { "@cfworker/json-schema": "^4.1.1" }, "optionalPeers": ["@cfworker/json-schema"] }, "sha512-xKd8OIzlqNzcqcNumGAa6g+PW2kjD5vrpcKOnfldAUPP3j7lnqMPwlTXQm8gF+UwH72z0lqaRbjr9hqGz0eITA=="],
 
diff --git a/convex/relay.ts b/convex/relay.ts
index 6641be9..3b3cbd5 100644
--- a/convex/relay.ts
+++ b/convex/relay.ts
@@ -5,9 +5,8 @@
  * The bootstrap token lives in `XCB_RELAY_BOOTSTRAP` on the deployment and
  * admits the first owner exactly once — it dies the moment a subject
  * verifies. OTP delivery defaults to `log`; `XCB_RELAY_EMAIL=resend` uses
- * Resend via `XCB_RESEND_API_KEY` / `XCB_RESEND_FROM`, `sendgrid` uses the
- * SendGrid v3 API via `XCB_SENDGRID_API_KEY` / `XCB_SENDGRID_FROM`, and
- * `webhook` POSTs the code to `XCB_OTP_WEBHOOK_URL` with bearer
+ * Resend via `XCB_RESEND_API_KEY` / `XCB_RESEND_FROM`, and `webhook`
+ * POSTs the code to `XCB_OTP_WEBHOOK_URL` with bearer
  * `XCB_OTP_WEBHOOK_TOKEN`. */
 
 import { defineRelay } from "@hraness/relay/backend";
@@ -15,11 +14,9 @@ import type { EmailTransport } from "@hraness/relay/wire";
 
 const email: EmailTransport = process.env.XCB_RELAY_EMAIL === "resend"
   ? { mode: "resend", keyEnv: "XCB_RESEND_API_KEY", fromEnv: "XCB_RESEND_FROM" }
-  : process.env.XCB_RELAY_EMAIL === "sendgrid"
-    ? { mode: "sendgrid", keyEnv: "XCB_SENDGRID_API_KEY", fromEnv: "XCB_SENDGRID_FROM" }
-    : process.env.XCB_RELAY_EMAIL === "webhook"
-      ? { mode: "webhook", urlEnv: "XCB_OTP_WEBHOOK_URL", tokenEnv: "XCB_OTP_WEBHOOK_TOKEN" }
-      : { mode: "log" };
+  : process.env.XCB_RELAY_EMAIL === "webhook"
+    ? { mode: "webhook", urlEnv: "XCB_OTP_WEBHOOK_URL", tokenEnv: "XCB_OTP_WEBHOOK_TOKEN" }
+    : { mode: "log" };
 
 export const relay = defineRelay({
   namespace: "xcb.relay.v1",
@@ -37,4 +34,5 @@ export const relay = defineRelay({
   openSignup: false,
   bootstrapInviteEnv: "XCB_RELAY_BOOTSTRAP",
   authProviderId: "xcb-otp-v1",
+  productName: "xcb",
 });
diff --git a/docs/relay-deployment.md b/docs/relay-deployment.md
index 064a097..045a0f6 100644
--- a/docs/relay-deployment.md
+++ b/docs/relay-deployment.md
@@ -23,9 +23,9 @@ Set the relay's environment with `npx convex env set <KEY> <value>`:
   forced refresh signs a new session, and the call retries.
 - `XCB_RELAY_BOOTSTRAP`: a one-time invite for the first owner. It stops working
   once an owner is verified; set a fresh value only when rebuilding a fleet.
-- `XCB_RELAY_EMAIL`: how sign-in codes are delivered: `log`, `sendgrid`,
-  `resend`, or `webhook`. `sendgrid` needs `XCB_SENDGRID_API_KEY` and
-  `XCB_SENDGRID_FROM` (a verified sender); `resend` needs `XCB_RESEND_API_KEY`
-  and `XCB_RESEND_FROM`; `webhook` needs `XCB_OTP_WEBHOOK_URL` and
-  `XCB_OTP_WEBHOOK_TOKEN`. With `log`, codes are printed to the function log,
-  which you read from an authenticated Convex session with `npx convex logs`.
+- `XCB_RELAY_EMAIL`: how sign-in codes are delivered: `log`, `resend`, or
+  `webhook`. `resend` needs `XCB_RESEND_API_KEY` and `XCB_RESEND_FROM` (a
+  branded sender on a verified domain, e.g. `xcb <xcb@auth.hraness.com>`);
+  `webhook` needs `XCB_OTP_WEBHOOK_URL` and `XCB_OTP_WEBHOOK_TOKEN`. With
+  `log`, codes are printed to the function log, which you read from an
+  authenticated Convex session with `npx convex logs`.
diff --git a/package.json b/package.json
index 5600c2d..8942471 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,7 @@
   },
   "devDependencies": {
     "@convex-dev/auth": "0.0.95",
-    "@hraness/relay": "github:hraness/relay#2558a0d860d35ec2537cc135380ea4bd89db1c8f",
+    "@hraness/relay": "github:hraness/relay#5ef01b0613ac49c4da0fcb8d2ee81e667c592992",
     "@types/bun": "1.4.2",
     "@types/node": "26.6.2",
     "convex": "1.45.0",