Move send_mail() to own module

agenda/mail.py

@@ -0,0 +1,28 @@
+"""Send e-mail."""
+
+import smtplib
+from email.message import EmailMessage
+from email.utils import formatdate, make_msgid
+
+import flask
+
+
+def send_mail(config: flask.config.Config, subject: str, body: str) -> None:
+    """Send an e-mail."""
+    msg = EmailMessage()
+
+    msg["Subject"] = subject
+    msg["To"] = f"{config['NAME']} <{config['MAIL_TO']}>"
+    msg["From"] = f"{config['NAME']} <{config['MAIL_FROM']}>"
+    msg["Date"] = formatdate()
+    msg["Message-ID"] = make_msgid()
+
+    # Add extra mail headers
+    for header, value in config["MAIL_HEADERS"]:
+        msg[header] = value
+
+    msg.set_content(body)
+
+    s = smtplib.SMTP(config["SMTP_HOST"])
+    s.sendmail(config["MAIL_TO"], [config["MAIL_TO"]], msg.as_string())
+    s.quit()