python smtplibメール添付ファイルを使用して複数人を写し取るなど(親測有効)

import os
import smtplib
import base64
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart


class SendEmail(object):
    def __init__(self, username, passwd, recv, title, content,
                 file=None, ssl=False,
                 email_host='smtp.163.com', port=25, ssl_port=465):
        self.username = username  #    
        self.passwd = passwd  #    ，          
        self.recv = recv  #    ，    list ['[email protected]','[email protected]]
        self.title = title  #     
        self.content = content  #     
        self.file = file  #     ，         ，      
        self.email_host = email_host  # smtp     ，163  smtp.163.com
        self.port = port  #     
        self.ssl = ssl  #       
        self.ssl_port = ssl_port  #       

    def send_email(self):
        msg = MIMEMultipart()
        #        
        if self.file:  #      
            file_name = os.path.split(self.file)[-1]  #      ，    
            try:
                f = open(self.file, 'rb').read()
            except Exception as e:
                raise Exception('     ！！！！%s' % e)
            else:
                att = MIMEText(f, "base64", "utf-8")
                att["Content-Type"] = 'application/octet-stream'
                # base64.b64encode(file_name.encode()).decode()
                new_file_name = '=?utf-8?b?' + base64.b64encode(file_name.encode()).decode() + '?='
                #              ，     
                att["Content-Disposition"] = 'attachment; filename="%s"' % (new_file_name)
                msg.attach(att)
        msg.attach(MIMEText(self.content))  #        
        msg['Subject'] = self.title  #     
        msg['From'] = self.username  #      
        msg['To'] = ','.join(self.recv)  #        
        if self.ssl:
            self.smtp = smtplib.SMTP_SSL(self.email_host, port=self.ssl_port)
        else:
            self.smtp = smtplib.SMTP(self.email_host, port=self.port)
        #           
        self.smtp.login(self.username, self.passwd)
        try:
            self.smtp.sendmail(self.username, self.recv, msg.as_string())
            pass
        except Exception as e:
            print('   。。', e)
        else:
            print('    ！')
        self.smtp.quit()


if __name__ == '__main__':

    m = SendEmail(
        username='@163.com',
        passwd='',
        recv=[''],
        title='',
        content='      ',
        file=r'E:\a.png',
        ssl=True,
    )
    m.send_email()