I want to make a script that uses nxapi to read my Nintendo Switch friend list, and send me an email if someone in the “watched” section of my configuration file comes online. My website is hosted by DreamHost. I keep getting an SMTPRecipientsRefused error when trying to send a test email.

The script:

import json
import yaml
import os
import subprocess
import smtplib
import datetime
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
import random

configpath = os.path.expanduser("~/.littlebitstudios/switchfriendwatch/configuration.yaml")

try:
  config = yaml.safe_load(open(configpath))
except FileNotFoundError:
  print("No configuration file! Create a file at", configpath, "and follow the format detailed on the project page.")
  exit()

# Setting up SMTP if email is enabled
mailsender = None
if config['email']['enabled'] == True:
  print("Email enabled.")
  print("Connecting to email server")
  try:
    mailsender = smtplib.SMTP(config['email']['server'], config['email']['port'])
    print("Logging in to email server")
    mailsender.login(config['email']['user'], config['email']['pass'])
    mailsender.ehlo_or_helo_if_needed()
    mailsender.starttls()
  except (smtplib.SMTPAuthenticationError, smtplib.SMTPConnectError, smtplib.SMTPException) as e:
    print(f"Error connecting to email server: {e}")
    exit()

# Gather NSO friend data from nxapi
nxapi = subprocess.run(["nxapi", "nso", "friends", "--json"], capture_output=True)
friends = None
if nxapi.returncode == 0:
  friends = json.loads(nxapi.stdout.decode("utf-8"))
else:
  print("Error running nxapi. Please check the tool and its installation.")


lastchecktime = datetime.datetime.fromisoformat(config['lastcheck'])
print("Last run time:",lastchecktime.strftime("%b %d, %Y at %I:%M %p"))

def mailsendonline(username, game, lastchange):
  message = MIMEMultipart()
  message['From'] = config['email']['sendfrom']
  message['To'] = config['email']['sendto']
  message['Subject'] = "Switch Friend Watch: " + username + " is online playing " + game

  # Create MIMEText object for the message body
  body_text = MIMEText("Your friend " + username + " is now online playing " + game + ". nLast status update: " + lastchange.strftime("%b %d, %Y at %I:%M %p") + "." + "nnSwitch Friend Watchna tool by LittleBit", 'plain')
  message.attach(body_text)

  # Send the email using the provided SMTP object (mailsender)
  mailsender.sendmail(config['email']['sendfrom'], config['email']['sendto'], message.as_string())

  # Optional: Print a success message
  print("Email sent successfully!")


# Checking for watched users online, and making sure their status has changed since the last time the script ran
for friend in friends:
    for watched in config['watched']:
        if datetime.datetime.fromtimestamp(friend['presence']['updatedAt']) > datetime.datetime.fromisoformat(config['lastcheck']):
          if watched['type']=="name":
            if friend['name']==watched['value']:
              if friend['presence']['state']=="ONLINE":
                print(friend['name'],"is watched and is online!")
                if config['email']['enabled']:
                  mailsendonline(friend['name'], friend['presence']['game']['name'], datetime.datetime.fromtimestamp(friend['presence']['updatedAt']))
              else:
                print(friend['name'],"is watched but isn't online.")
          elif watched['type']=="id":
            if friend['id']==watched['value']:
              if friend['presence']['state']=="ONLINE":
                print(friend['name'],"is watched and is online!")
              else:
                print(friend['name'],"is watched but isn't online.")
        else:
          print(friend['name'],"'s status hasn't changed since the script last ran, ignoring. Last change: ",datetime.datetime.fromtimestamp(friend['presence']['updatedAt']).strftime("%b %d, %Y at %I:%M %p"),sep="")
config['lastcheck'] = datetime.datetime.now().isoformat()

if config['email']['enabled']:
  if config['email']['sendtest']:
    print("Email enabled with sendtest flag set, sending a test email!")
    hashtagnumber=random.randint(1000,9999)
    mailsendonline("Player#"+str(hashtagnumber), "TestGame", datetime.datetime.now())
    config['email']['sendtest']=False

with open(configpath, 'w') as outfile:
    yaml.dump(config, outfile, default_flow_style=False)

I expected the script to finish without any errors, and an email to appear in my inbox.

What happened was an exception:

Traceback (most recent call last):
  File "/home/jaherron/code/python/switchfriendwatch.py", line 89, in <module>
    mailsendonline("Player#"+str(hashtagnumber), "TestGame", datetime.datetime.now())
  File "/home/jaherron/code/python/switchfriendwatch.py", line 57, in mailsendonline
    mailsender.sendmail(config['email']['sendfrom'], config['email']['sendto'], message.as_string())
  File "/usr/lib/python3.11/smtplib.py", line 901, in sendmail
    raise SMTPRecipientsRefused(senderrs)
smtplib.SMTPRecipientsRefused: {'[My personal email]': (554, b'5.7.1 <[My personal email]>: Recipient address rejected: Access denied')}