在一個項目中，執行了一個任務后卻收不到設定的郵件，經過異常捕獲發現，在發送郵件時報了如下錯誤:

smtplib.SMTPDataError: (503, b'Error: need RCPT command')

復現異常

>>> cc_email = ['None'] >>> send_email(subject=subject, content=content, domain=domain, to_email=to_email, cc_email=cc_email) Traceback (most recent call last):File "<console>", line 1, in <module>File "/data/web/scripts/py/custom_send_email.py", line 43, in send_emailmsg.send()File "/usr/local/lib/python3.7/site-packages/django/core/mail/message.py", line 294, in sendreturn self.get_connection(fail_silently).send_messages([self])File "/usr/local/lib/python3.7/site-packages/django/core/mail/backends/smtp.py", line 110, in send_messagessent = self._send(message)File "/usr/local/lib/python3.7/site-packages/django/core/mail/backends/smtp.py", line 126, in _sendself.connection.sendmail(from_email, recipients, message.as_bytes(linesep='\r\n'))File "/usr/local/lib/python3.7/smtplib.py", line 882, in sendmail(code, resp) = self.data(msg)File "/usr/local/lib/python3.7/smtplib.py", line 560, in dataraise SMTPDataError(code, repl) smtplib.SMTPDataError: (503, b'Error: need RCPT command')

后排查代碼，原來是在獲取抄送郵箱時獲取了一個包含"None"的列表。

解決辦法:

將cc_email = ['None'] 修改為 cc_email = None 或者 cc_email = []即可。

轉載于:https://my.oschina.net/u/4153263/blog/3070273

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