Python script send out more emails that it supposed to send

I tried the solution for the post here, but it didn't help.

Part of my python script sends out email to recipients. When I run the code in my Pycharm it sends out exactly 3 emails which is the number of email addresses for my test case and the number which it suppose to send out. However, when I try to run it on my raspberry pi it randomly sends out the emails and I cannot find a pattern of the difference number of emails that it sends out.

So, there is a list called 'toAddrs' which saves the email address of recipients. I tried the following to ways once using a for loop and once without a for loop. But both of these send an arbitrary number of emails.

#subject, fromAddr, mainbody and password are already defined
msg = MIMEMultipart('')
msg.attach(MIMEText(mainbody, 'plain'))
msg['Subject'] = subject
msg['From'] = fromAddr
msg['To'] = toAddrs
server = smtplib.SMTP('smtp.gmail.com', 587)
server.starttls()
server.login(fromAddr, password)

for i in range(len(toAddrs)):
server.sendmail(fromAddr, toAddrs[i], msg.as_string())
server.quit()


and another one is:

#subject, fromAddr, mainbody and password are already defined
msg = MIMEMultipart('')
msg.attach(MIMEText(mainbody, 'plain'))
msg['Subject'] = subject
msg['From'] = fromAddr
msg['To'] = ' ,'.join(toAddrs)
server = smtplib.SMTP('smtp.gmail.com', 587)
server.starttls()
server.login(fromAddr, password)
server.sendmail(fromAddr, toAddrs, msg.as_string())
server.quit()


I cannot find what might be wrong. I will appreciate any help.

', '.join(toAddress) is a string of the form

join(toAddress)

join

NameError

print(', '.join(toAddress))

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