Add membership termination reminder mail on move out

pycroft/lib/mail/__init__.py

@@ -0,0 +1,45 @@
+"""
+pycroft.lib.mail
+~~~~~~~~~~~~~~~~
+"""
+
+from __future__ import annotations
+import typing as t
+
+
+from .concepts import Mail, MailTemplate
+from .config import MailConfig, config, _config_var
+from .submission import send_mails, RetryableException
+from .templates import (
+    UserConfirmEmailTemplate,
+    UserResetPasswordTemplate,
+    UserMovedInTemplate,
+    UserCreatedTemplate,
+    MemberRequestPendingTemplate,
+    MemberRequestDeniedTemplate,
+    MemberRequestMergedTemplate,
+    TaskFailedTemplate,
+    MemberNegativeBalance,
+)
+
+
+def send_template_mails(
+    email_addresses: list[str], template: MailTemplate, **kwargs: t.Any
+) -> None:
+    mails = []
+
+    for addr in email_addresses:
+        body_plain, body_html = template.render(**kwargs)
+
+        mail = Mail(
+            to_name="",
+            to_address=addr,
+            subject=template.subject,
+            body_plain=body_plain,
+            body_html=body_html,
+        )
+        mails.append(mail)
+
+    from pycroft.task import send_mails_async
+
+    send_mails_async.delay(mails)