create mail forwarder

.gitignore

@@ -1,3 +1,5 @@
+command.sh
+
 # ---> Python
 # Byte-compiled / optimized / DLL files
 __pycache__/

mail-forwarder/__main__.py

@@ -0,0 +1,89 @@
+import smtplib, imaplib, email, ssl, os
+from email import policy 
+
+imap_host = os.getenv('IMAP_HOST', "imap.mail.yahoo.com")
+smtp_host = os.getenv('SMTP_HOST', "smtp.mail.yahoo.com")
+
+smtp_port = os.getenv('SMTP_PORT', 587) # SSL
+
+sender = os.environ.get('SENDER_USERNAME')
+passwd = os.environ.get('SENDER_PASSWORD')
+recipient = os.environ.get('RECIPIENT_EMAIL')
+
+subject_search = os.environ.get('SUBJECT_SEARCH')
+
+if sender is None:
+    print("ERROR: Environment variable SENDER_USERNAME is not defined")
+    exit()
+
+if passwd is None:
+    print("ERROR: Environment variable SENDER_PASSWORD is not defined")
+    exit()
+
+if recipient is None:
+    print("ERROR: Environment variable RECIPIENT_EMAIL is not defined")
+    exit()
+
+if subject_search is None:
+    print("ERROR: Environment variable SUBJECT_SEARCH is not defined")
+    exit()
+
+# open IMAP connection and fetch message with id msgid
+# store message data in email_data
+print("Creating IMAP client...")
+imap = imaplib.IMAP4_SSL(imap_host)
+
+print("Logging in to IMAP server...")
+imap.login(sender, passwd)
+
+print("Listing mailboxes...")
+print(imap.list())
+
+print("Selecting INBOX...")
+imap.select('INBOX')
+
+print("Searching emails...")
+status, msgs = imap.search(None, 'SUBJECT', f'"{subject_search}"')
+
+context = ssl.SSLContext(ssl.PROTOCOL_TLS)
+
+print("Instantiating SMTP client...")
+smtp = smtplib.SMTP(smtp_host, smtp_port)
+smtp.starttls(context=context)
+
+print("Logging in to SMTP server...")
+smtp.login(sender, passwd)
+
+for num in msgs[0].split():
+    status, data = imap.fetch(num, '(RFC822)')
+    message_bytes = data[0][1]
+    
+    print("Parsing message with default policy...")
+    original_msg = email.message_from_bytes(message_bytes, policy=policy.default)
+    
+    print("Constructing message copy...")
+    copied_msg = email.message.EmailMessage()
+    copied_msg['From'] = sender
+    copied_msg['To'] = recipient
+    copied_msg['Subject'] = original_msg['Subject']
+    copied_msg['Date'] = original_msg['Date']
+    copied_msg['MIME-Version'] = original_msg['MIME-Version']
+    copied_msg['Content-Type'] = original_msg['Content-Type']
+    
+    print("Copying message contents...")
+    for part in original_msg.walk():
+        copied_msg.attach(part)
+    
+    print("Sending new message...")
+    print("Date is: ", copied_msg['Date'])
+    smtp.send_message(copied_msg, sender, recipient)
+    print("Message sent.")
+
+    print("Sending message to trash...")
+    imap.store(num, '+FLAGS', '\\Deleted')
+    print("Message marked for deletion...")
+
+imap.expunge()
+imap.close()
+imap.logout()
+smtp.quit()

pyproject.toml

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+[tool.poetry]
+name = "mail-forwarder"
+version = "0.1.0"
+description = ""
+authors = ["alex"]
+
+[tool.poetry.dependencies]
+python = "^3.9"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"