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-rw-r--r--changelog.d/16329.bugfix1
-rw-r--r--synapse/handlers/send_email.py4
2 files changed, 3 insertions, 2 deletions
diff --git a/changelog.d/16329.bugfix b/changelog.d/16329.bugfix
new file mode 100644
index 0000000000..2f1f7e8ffe
--- /dev/null
+++ b/changelog.d/16329.bugfix
@@ -0,0 +1 @@
+Use standard name for UTF-8 charset in emails.
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