diff --git a/src/sdk.ts b/src/sdk.ts
index 64ac365..a015c63 100644
--- a/src/sdk.ts
+++ b/src/sdk.ts
@@ -13,7 +13,6 @@ import { createScheduledHandler } from './instrumentation/scheduled.js'
 //@ts-ignore
 import * as versions from '../versions.json'
 import { createEmailHandler } from './instrumentation/email.js'
-import { EmailMessage } from 'cloudflare:email'
 
 type FetchHandler = ExportedHandlerFetchHandler<unknown, unknown>
 type ScheduledHandler = ExportedHandlerScheduledHandler<unknown>
@@ -35,10 +34,6 @@ export function isAlarm(trigger: Trigger): trigger is 'do-alarm' {
 	return trigger === 'do-alarm'
 }
 
-export function isEmailMessage(trigger: Trigger): trigger is ForwardableEmailMessage {
-	return !!(trigger instanceof EmailMessage && trigger.headers && trigger.forward)
-}
-
 const createResource = (config: ResolvedTraceConfig): Resource => {
 	const workerResourceAttrs = {
 		'cloud.provider': 'cloudflare',
diff --git a/tsup.config.ts b/tsup.config.ts
index fc5f993..b7ee126 100644
--- a/tsup.config.ts
+++ b/tsup.config.ts
@@ -6,5 +6,4 @@ export default defineConfig({
 	dts: true,
 	clean: true,
 	sourcemap: true,
-	external: ['cloudflare:email'],
 })