Add EMAIL_SEND_FROM configuration option

docs/guide/configuration.rst

@@ -175,10 +175,19 @@ Alerts can be tested using the ``rcb alerts`` command.
 This will send a test message to all configured alert
 backends.
 
+EMAIL_SEND_FROM
+~~~~~~~~~~~~~
+
+The email address to send alerts from. If not set, the ``EMAIL_HOST_USER`` will be used as the sender address.
+
+Alerts can be tested using the ``rcb alerts`` command.
+This will send a test message to all configured alert
+backends.
+
 EMAIL_SEND_TO
 ~~~~~~~~~~~~~
 
-The email address to send alerts
+The email address to send alerts to. Multiple addresses can be separated by a space.
 
 Alerts can be tested using the ``rcb alerts`` command.
 This will send a test message to all configured alert

src/restic_compose_backup/alerts/smtp.py

@@ -11,12 +11,13 @@
 class SMTPAlert(BaseAlert):
     name = "smtp"
 
-    def __init__(self, host, port, user, password, to):
+    def __init__(self, host, port, user, password, from_addr, to_addr):
         self.host = host
         self.port = port
         self.user = user
         self.password = password or ""
-        self.to = to
+        self.from_addr = from_addr
+        self.to_addr = to_addr
 
     @classmethod
     def create_from_env(cls):
@@ -25,6 +26,7 @@ def create_from_env(cls):
             os.environ.get("EMAIL_PORT"),
             os.environ.get("EMAIL_HOST_USER"),
             os.environ.get("EMAIL_HOST_PASSWORD"),
+            (os.environ.get("EMAIL_SEND_FROM") or os.environ.get("EMAIL_HOST_USER")),
             (os.environ.get("EMAIL_SEND_TO") or "").split(","),
         )
         if instance.properly_configured:
@@ -34,13 +36,12 @@ def create_from_env(cls):
 
     @property
     def properly_configured(self) -> bool:
-        return self.host and self.port and self.user and len(self.to) > 0
-
+        return self.host and self.port and self.user and self.from_addr and self.to_addr
     def send(self, subject: str = None, body: str = None, alert_type: str = "INFO"):
         msg = MIMEText(body)
         msg["Subject"] = f"[{alert_type}] {subject}"
-        msg["From"] = self.user
-        msg["To"] = ", ".join(self.to)
+        msg["From"] = self.from_addr
+        msg["To"] = ", ".join(self.to_addr)
 
         try:
             logger.info("Connecting to %s port %s", self.host, self.port)
@@ -61,7 +62,7 @@ def send(self, subject: str = None, body: str = None, alert_type: str = "INFO"):
                     return
             server.ehlo()
             server.login(self.user, self.password)
-            server.sendmail(self.user, self.to, msg.as_string())
+            server.sendmail(self.from_addr, self.to_addr, msg.as_string())
             logger.info("Email sent")
         except Exception as ex:
             logger.exception(ex)

stack-back.env.template

@@ -23,6 +23,7 @@ CRON_SCHEDULE=0 2 * * *
 # EMAIL_PORT=
 # EMAIL_HOST_USER=
 # EMAIL_HOST_PASSWORD=
+# EMAIL_SEND_FROM=
 # EMAIL_SEND_TO=
 
 # DISCORD_WEBHOOK=