Set email charset as utf-8 rather than utf8 (#16329)

1 files changed, 2 insertions, 2 deletions

diff --git a/synapse/handlers/send_email.py b/synapse/handlers/send_email.py

index 4f5fe62fe8..657d9b3559 100644
--- a/synapse/handlers/send_email.py
+++ b/synapse/handlers/send_email.py
@@ -174,8 +174,8 @@ class SendEmailHandler:
         if raw_to == "":
             raise RuntimeError("Invalid 'to' address")
 
-        html_part = MIMEText(html, "html", "utf8")
-        text_part = MIMEText(text, "plain", "utf8")
+        html_part = MIMEText(html, "html", "utf-8")
+        text_part = MIMEText(text, "plain", "utf-8")
 
         multipart_msg = MIMEMultipart("alternative")
         multipart_msg["Subject"] = subject