Add notify_change to log and Date header to email notifications

src/ddns_service/email.py

@@ -5,6 +5,7 @@ import smtplib
 
 from . import datetime_str
 from email.mime.text import MIMEText
+from email.utils import formatdate
 from jinja2 import Environment, BaseLoader
 
 
@@ -70,6 +71,7 @@ class EmailService:
             msg["Subject"] = subject
             msg["From"] = self.config["from_address"]
             msg["To"] = to
+            msg["Date"] = formatdate(localtime=True)
 
             smtp_host = self.config["smtp_host"]
             smtp_port = self.config["smtp_port"]