How to log smtplib python emails to a log file06.07.21

The smtplib prints directly to stderr, capture it and send it to a log file:

import tempfile, smtplib, os, sys
import logging
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
logging.basicConfig(filename='logs/mail.log', filemode='a', format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')

def start_loggin():
  # Find an available file descriptor                                                                                                                                                                                                   
  t = tempfile.TemporaryFile()
  available_fd = t.fileno()
  t.close()

# now make a copy of stderr                                                                                                                                                                                                           
  os.dup2(2,available_fd)

# Now create a new tempfile and make Python's stderr go to that file                                                                                                                                                                  
  t = tempfile.TemporaryFile()
  os.dup2(t.fileno(),2)

return [t,available_fd]

def end_loggin(o):
  t = o[0]
  available_fd = o[1]

# Grab the stderr from the temp file                                                                                                                                                                                                  
  sys.stderr.flush()
  t.flush()
  t.seek(0)
  stderr_output = t.read()
  t.close()

# Put back stderr                                                                                                                                                                                                                     
  os.dup2(available_fd,2)
  os.close(available_fd)

# Send to logger                                                                                                                                                                                                                      
  count = 0
  for line in stderr_output.decode('utf-8').split("\n"):
    count += 1
    logging.warning("{:3} {}".format(count,line))

https://stackoverflow.com/questions/34294251/capture-debug-output-from-python-smtplib

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How to log smtplib python emails to a log file06.07.21

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