I wrote a code to send a confirmation email with Python and it works, but when I put it in the function, sending the code has a problem. Please help me. code :

import smtplib
import random
verify_code=str(random.randint(1111,9999))
sent_from = 'code@r*****'
password='*******'
to = ['re******@gmail.com']
subject = 'verify code'
body = ('your code is :' str(code))


email_text = """\
From: %s
To: %s
Subject: %s

%s
""" % (sent_from, ", ".join(to), subject, body)

smtp_server = smtplib.SMTP_SSL('mx2.ta*******.com', 465)
smtp_server.ehlo()
smtp_server.login(sent_from, password)
smtp_server.sendmail(sent_from, to, email_text)
smtp_server.close()
print ("Email sent successfully!")

and When I put in the function :

def mail(code):
    import smtplib
    import random
    code=str(random.randint(1111,9999))
    sent_from = 'code@r****'
    password='*******'
    to = ['re*******@gmail.com']
    subject = 'verify code'
    body = ('your code is :' str(code))


    email_text = """\
    From: %s
    To: %s
    Subject: %s

    %s
    """ % (sent_from, ", ".join(to), subject, body)
    
    smtp_server = smtplib.SMTP_SSL('mx2.tal*****.com', 465)
    smtp_server.ehlo()
    smtp_server.login(sent_from, password)
    smtp_server.sendmail(sent_from, to, email_text)
    smtp_server.close()
    print ("Email sent successfully!")

Error while executing the function:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

reza*****@gmail.com host gmail-smtp-in.l.google.com [108.177.126.27] SMTP error from remote mail server after end of data: 550-5.7.1 [185.51..] Our system has detected that this message is not RFC 550-5.7.1 5322 compliant: 550-5.7.1 'From' header is missing. 550-5.7.1 To reduce the amount of spam sent to Gmail, this message has been 550-5.7.1 blocked. Please visit 550-5.7.1 https://support.google.com/mail/?p=RfcMessageNonCompliant 550 5.7.1 and review RFC 5322 specifications for more information.

CodePudding user response：

Attempt 1 : ratelimit number of emails sent

You are probably sending too many emails at once. Try waiting a few seconds between each email. Since you are using a Gmail account to send emails, you might want to have a look at the email quotas imposed by Google.

Also if you are calling your function in a loop, you are sending multiple emails to the same recipient. The parameter of your function should the email of the recipient instead of code.

import smtplib
import random
import time

def mail(recipient):

    code = str(random.randint(1111, 9999))
    sent_from = 'code@r****'
    password = '*******'
    to = [recipient]
    subject = 'verify code'
    body = ('your code is :' str(code))
    email_text = """From: %s
    To: %s
    Subject: %s
    
    %s
    """ % (sent_from, ", ".join(to), subject, body)

    smtp_server = smtplib.SMTP_SSL('mx2.tal*****.com', 465)
    smtp_server.ehlo()
    smtp_server.login(sent_from, password)
    smtp_server.sendmail(sent_from, to, email_text)
    smtp_server.close()
    print("Email sent successfully!")


recipient_list = ['[email protected]', '[email protected]']
for recipient in recipient_list:
    mail(recipient)
    time.sleep(1)  # wait 1s before sending next email

Attempt 2 : use CLRF character directly in email_text

Format of email field required by RFC 5322 :

"From:" mailbox-list CRLF

import smtplib
import random


def mail():
    code = str(random.randint(1111, 9999))
    sent_from = 'code@r****'
    password = '*******'
    to = ['re*******@gmail.com']
    subject = 'verify code'
    body = ('your code is :' str(code))

    email_text = (
        """From: %s\r\nTo: %s\r\nSubject: %s\r\n\r\n%s"""
        % (sent_from, ", ".join(to), subject, body))

    print(email_text)
    smtp_server = smtplib.SMTP_SSL('mx2.tal*****.com', 465)
    smtp_server.ehlo()
    smtp_server.login(sent_from, password)
    smtp_server.sendmail(sent_from, to, email_text)
    smtp_server.close()
    print("Email sent successfully!")


mail()