122 lines
3.3 KiB
Python
122 lines
3.3 KiB
Python
#!/usr/bin/env python3
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"""Check IMAP inbox for bounce-back / delivery-failure emails and alert if found.
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Silent (exit 0 with no output) when nothing to report.
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Outputs summary when bounces are found.
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"""
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import imaplib
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import email
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from email.utils import parsedate_to_datetime
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import os
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import sys
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from datetime import datetime, timedelta, timezone
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HOST = "mail.germainebrown.com"
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PORT = 993
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ACCOUNTS = [
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{"user": "g@germainebrown.com", "pw_file": "/root/.config/himalaya/g-germainebrown.pass", "label": "Germaine"},
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{"user": "shonuff@germainebrown.com", "pw": "Catches.bullets1985", "label": "Sho'Nuff"},
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]
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CHECK_HOURS = 24
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BOUNCE_KEYWORDS = [
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"mail delivery failed", "delivery status notification", "undelivered",
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"returned mail", "mail delivery failure", "non-delivery",
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"delivery failed", "undeliverable", "delivery report",
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"returned to sender", "message bounced",
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]
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BOUNCE_SENDERS = [
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"mailer-daemon", "postmaster", "mail delivery system",
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]
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def safe_str(val):
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if val is None:
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return ""
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if isinstance(val, str):
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return val
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try:
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return str(val)
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except Exception:
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return ""
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def is_bounce(msg):
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subject = safe_str(msg.get("Subject", "")).lower()
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sender = safe_str(msg.get("From", "")).lower()
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for kw in BOUNCE_KEYWORDS:
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if kw in subject:
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return True
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for s in BOUNCE_SENDERS:
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if s in sender:
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return True
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if msg.get_content_type() == "text/plain":
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payload = msg.get_payload(decode=True)
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if payload:
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body = safe_str(payload).lower()
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if "permanent error" in body or "could not be delivered" in body:
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return True
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return False
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def main():
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all_bounces = []
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since = (datetime.now(timezone.utc) - timedelta(hours=CHECK_HOURS)).strftime("%d-%b-%Y")
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for acct in ACCOUNTS:
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try:
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if "pw" in acct:
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pw = acct["pw"]
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else:
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pw = open(acct["pw_file"]).read().strip()
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except FileNotFoundError:
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continue
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try:
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conn = imaplib.IMAP4_SSL(HOST, PORT)
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conn.login(acct["user"], pw)
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conn.select("INBOX")
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except Exception as e:
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print(f"ERROR: {acct['label']} IMAP failed: {e}")
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continue
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status, data = conn.search(None, f'(SINCE {since})')
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if status != "OK":
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conn.logout()
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continue
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for num in data[0].split():
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status, msg_data = conn.fetch(num, "(RFC822)")
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if status != "OK":
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continue
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raw = email.message_from_bytes(msg_data[0][1])
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if is_bounce(raw):
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all_bounces.append({
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"account": acct["label"],
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"subject": raw.get("Subject", "(no subject)"),
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"from": raw.get("From", "(unknown)"),
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"date": raw.get("Date", ""),
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})
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conn.logout()
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if not all_bounces:
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return
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print(f"📬 {len(all_bounces)} bounce-back(s) detected in the last {CHECK_HOURS}h:\n")
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for b in all_bounces:
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print(f" [{b['account']}] {b['subject']}")
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print(f" From: {b['from']}")
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print(f" Date: {b['date']}")
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print()
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if __name__ == "__main__":
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main()
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