* 겪고 있는 문제 상황을 최대한 자세하게 작성해주세요.

* 문제 해결을 위해 어떤 시도를 해보았는지 구체적으로 함께 알려주세요.

이메일 발송 기능 익히기 (1) 에서 이메일 한명한테 보내는건 성공을 하였는데요(2:30초까지는 성공이 출력되었고, 메일 발송 된 것을 확인함)

여러명 보내는 부분 에서 왜 오류가 뜨는지 이해를 못하겠습니다.

오타는 없는 거 같은데 어떤 오류인가요..??

보고 계신 화면 전체를 캡처해 주시면, 튜터님들이 빠르게 상황을 이해할 수 있어요.

작성한 코드

from smtplib import SMTP_SSL
from email.message import EmailMessage


customer_list = [
    'eoqkr060427@gmail.com'
    'eoqkr060427@gmail.com'
    'eoqkr060427@gmail.com'


]


# 이메일 메시지 설정
for customer in customer_list:
    msg = EmailMessage()
    msg['Subject'] = '업무자동화 종합반 테스트'
    msg['From'] = 'eoqkr060427@gmail.com'
    msg['To'] = customer
    msg.set_content('This is a test email.')


# SMTP 설정 및 이메일 전송
with SMTP_SSL('smtp.gmail.com', 465) as smtp:
    smtp.login('eoqkr060427@gmail.com', 'eyxv dznb ognq otxl')
    smtp.send_message(msg)


print("성공!")

에러난코드

(.venv) C:\Users\hyery\OneDrive\바탕 화면\automation\crawling>"c:/Users/hyery/OneDrive/바탕 화 
면/automation/crawling/.venv/Scripts/python.exe" "c:/Users/hyery/OneDrive/바탕 화면/automation/crawling/send_email.py"
Traceback (most recent call last):
  File "c:\Users\hyery\OneDrive\바탕 화면\automation\crawling\send_email.py", line 22, in <module>
    smtp.send_message(msg)
  File "C:\Users\hyery\AppData\Local\Programs\Python\Python310\lib\smtplib.py", line 986, in send_message
    return self.sendmail(from_addr, to_addrs, flatmsg, mail_options,
  File "C:\Users\hyery\AppData\Local\Programs\Python\Python310\lib\smtplib.py", line 901, in sendmail
    raise SMTPRecipientsRefused(senderrs)
smtplib.SMTPRecipientsRefused: {'': (555, b'5.5.2 Syntax error, cannot decode response. For more information, go to\n5.5.2  https://support.google.com/a/answer/3221692 and review RFC 5321\n5.5.2 specifications. d2e1a72fcca58-70b43967825sm4785696b3a.122 - gsmtp')}


(.venv) C:\Users\hyery\OneDrive\바탕 화면\automation\crawling>"c:/Users/hyery/OneDrive/바탕 화
면/automation/crawling/.venv/Scripts/python.exe" "c:/Users/hyery/OneDrive/바탕 화면/automation/crawling/send_email.py"
Traceback (most recent call last):
  File "c:\Users\hyery\OneDrive\바탕 화면\automation\crawling\send_email.py", line 22, in <module>
    smtp.send_message(msg)
  File "C:\Users\hyery\AppData\Local\Programs\Python\Python310\lib\smtplib.py", line 986, in send_message
    return self.sendmail(from_addr, to_addrs, flatmsg, mail_options,
  File "C:\Users\hyery\AppData\Local\Programs\Python\Python310\lib\smtplib.py", line 902, in sendmail
    (code, resp) = self.data(msg)
  File "C:\Users\hyery\AppData\Local\Programs\Python\Python310\lib\smtplib.py", line 571, in data
    raise SMTPDataError(code, repl)
smtplib.SMTPDataError: (503, b'5.5.1 RCPT first. A mail transaction protocol command was issued out of\n5.5.1 sequence. For more information, go to\n5.5.1  https://support.google.com/a/answer/3221692 and review RFC 5321\n5.5.1 specifications. d9443c01a7336-1fbb6a0fbf0sm42381465ad.21 - gsmtp')


(.venv) C:\Users\hyery\OneDrive\바탕 화면\automation\crawling>"c:/Users/hyery/OneDrive/바탕 화
면/automation/crawling/.venv/Scripts/python.exe" "c:/Users/hyery/OneDrive/바탕 화면/automation/crawling/send_email.py"
Traceback (most recent call last):
  File "c:\Users\hyery\OneDrive\바탕 화면\automation\crawling\send_email.py", line 22, in <module>
    smtp.send_message(msg)
  File "C:\Users\hyery\AppData\Local\Programs\Python\Python310\lib\smtplib.py", line 986, in send_message
    return self.sendmail(from_addr, to_addrs, flatmsg, mail_options,
  File "C:\Users\hyery\AppData\Local\Programs\Python\Python310\lib\smtplib.py", line 901, in sendmail
    raise SMTPRecipientsRefused(senderrs)
smtplib.SMTPRecipientsRefused: {'': (555, b'5.5.2 Syntax error, cannot decode response. For more information, go to\n5.5.2  https://support.google.com/a/answer/3221692 and review RFC 5321\n5.5.2 specifications. d2e1a72fcca58-70b43898c7esm4791266b3a.5 - gsmtp')}


(.venv) C:\Users\hyery\OneDrive\바탕 화면\automation\crawling>"c:/Users/hyery/OneDrive/바탕 화
면/automation/crawling/.venv/Scripts/python.exe" "c:/Users/hyery/OneDrive/바탕 화면/automation/crawling/send_email.py"
Traceback (most recent call last):
  File "c:\Users\hyery\OneDrive\바탕 화면\automation\crawling\send_email.py", line 22, in <module>       
    smtp.send_message(msg)
  File "C:\Users\hyery\AppData\Local\Programs\Python\Python310\lib\smtplib.py", line 986, in send_message


    return self.sendmail(from_addr, to_addrs, flatmsg, mail_options,
  File "C:\Users\hyery\AppData\Local\Programs\Python\Python310\lib\smtplib.py", line 901, in sendmail    
    raise SMTPRecipientsRefused(senderrs)
smtplib.SMTPRecipientsRefused: {'': (555, b'5.5.2 Syntax error, cannot decode response. For more information, go to\n5.5.2  https://support.google.com/a/answer/3221692 and review RFC 5321\n5.5.2 specifications. d2e1a72fcca58-70b4389abb6sm4959105b3a.18 - gsmtp')}


(.venv) C:\Users\hyery\OneDrive\바탕 화면\automation\crawling>