diff --git a/examples/batch_email_send.py b/examples/batch_email_send.py
index e19e7d7..b5e48d0 100644
--- a/examples/batch_email_send.py
+++ b/examples/batch_email_send.py
@@ -10,13 +10,13 @@
 params: List[resend.Emails.SendParams] = [
     {
         "sender": "onboarding@resend.dev",
-        "to": ["carlosderich@gmail.com"],
+        "to": ["delivered@resende.dev"],
         "subject": "hey",
         "html": "<strong>hello, world!</strong>",
     },
     {
         "sender": "onboarding@resend.dev",
-        "to": ["carlosderich@gmail.com"],
+        "to": ["delivered@resende.dev"],
         "subject": "hello",
         "html": "<strong>hello, world!</strong>",
     },
diff --git a/examples/simple_email.py b/examples/simple_email.py
index 0ce8dd2..4d90860 100644
--- a/examples/simple_email.py
+++ b/examples/simple_email.py
@@ -7,7 +7,7 @@
 
 params: resend.Emails.SendParams = {
     "sender": "onboarding@resend.dev",
-    "to": ["carlosderich@gmail.com"],
+    "to": ["delivered@resend.dev"],
     "subject": "hi",
     "html": "<strong>hello, world!</strong>",
     "reply_to": "to@gmail.com",
diff --git a/examples/with_attachments.py b/examples/with_attachments.py
index 69caf8b..42aa32f 100644
--- a/examples/with_attachments.py
+++ b/examples/with_attachments.py
@@ -17,7 +17,7 @@
 # Define the email parameters
 params: resend.Emails.SendParams = {
     "sender": "onboarding@resend.dev",
-    "to": ["carlosderich@gmail.com"],
+    "to": ["delivered@resend.dev"],
     "subject": "hi",
     "html": "<strong>hello, world!</strong>",
     "attachments": [attachment],
diff --git a/examples/with_b64_attachments.py b/examples/with_b64_attachments.py
index fd827cb..bab5a4d 100644
--- a/examples/with_b64_attachments.py
+++ b/examples/with_b64_attachments.py
@@ -6,20 +6,28 @@
 if not os.environ["RESEND_API_KEY"]:
     raise EnvironmentError("RESEND_API_KEY is missing")
 
+# Read file
 f = open(
     os.path.join(os.path.dirname(__file__), "../resources/invoice.pdf"), "rb"
 ).read()
 
-b64 = base64.b64encode(f)
-b64_str = b64.decode("utf-8")
+# Read file bytes as a base64 string
+b64: bytes = base64.b64encode(f)
+b64_str: str = b64.decode("utf-8")
 
-params = {
-    "from": "onboarding@resend.dev",
+# Create attachment object from base64 string
+b64_attachment: resend.Attachment = {"filename": "invoice.pdf", "content": b64_str}
+
+# Email params
+params: resend.Emails.SendParams = {
+    "sender": "onboarding@resend.dev",
     "to": ["delivered@resend.dev"],
     "subject": "hello with base64 attachments",
     "html": "<strong>hello, world!</strong>",
-    "attachments": [{"filename": "invoice.pdf", "content": b64_str}],
+    "attachments": [b64_attachment],
 }
 
+# Send email
 email = resend.Emails.send(params)
-print(email)
+print("Email sent with base64 string attachment")
+print(f"Email ID: {email.id}")
diff --git a/examples/with_html_file_as_b64_attachment.py b/examples/with_html_file_as_b64_attachment.py
index 882aaf2..94d37f3 100644
--- a/examples/with_html_file_as_b64_attachment.py
+++ b/examples/with_html_file_as_b64_attachment.py
@@ -6,20 +6,28 @@
 if not os.environ["RESEND_API_KEY"]:
     raise EnvironmentError("RESEND_API_KEY is missing")
 
+# Read file
 f = open(
     os.path.join(os.path.dirname(__file__), "../resources/index.html"), "rb"
 ).read()
 
-b64 = base64.b64encode(f)
-b64_str = b64.decode("utf-8")
+# Read file bytes as a base64 string
+b64: bytes = base64.b64encode(f)
+b64_str: str = b64.decode("utf-8")
 
-params = {
-    "from": "onboarding@resend.dev",
+# Create attachment object from base64 string
+b64_attachment: resend.Attachment = {"filename": "file.html", "content": b64_str}
+
+# Email params
+params: resend.Emails.SendParams = {
+    "sender": "onboarding@resend.dev",
     "to": ["delivered@resend.dev"],
     "subject": "hello with base64 attachments",
     "html": "<strong>hello, world!</strong>",
-    "attachments": [{"filename": "file.html", "content": b64_str}],
+    "attachments": [b64_attachment],
 }
 
+# Send email
 email = resend.Emails.send(params)
-print(email)
+print("Sent email with base64 string attachment")
+print("Email ID: ", email.id)
diff --git a/resend/emails/_attachment.py b/resend/emails/_attachment.py
index e2b7a5f..90b020c 100644
--- a/resend/emails/_attachment.py
+++ b/resend/emails/_attachment.py
@@ -1,14 +1,14 @@
-from typing import List
+from typing import List, Union
 
 from typing_extensions import NotRequired, TypedDict
 
 
 class Attachment(TypedDict):
-    content: List[int]
+    content: Union[List[int], str]
     """
     Content of an attached file.
     This is a list of integers which is usually translated from a
-    "bytes" type.
+    "bytes" type, OR a string
     Ie: list(open("file.pdf", "rb").read())
     """
     filename: str