用python發送的smtp電子郵件中“發件人”字段的奇怪顯示

Question

我在 smtp 電子郵件中看到 From 字段的奇怪顯示。顯示就像；

發件人：test@gmail.com 收件人：test@gmail.com，主題：郵件 test@gmail.com 至：

to 字段為空，但另一個“to”收件人，即 test1@gmail.com 成功收到了電子郵件。 下面是我的代碼。

import smtplib

def SendEmailScenario1():
    gmail_user = "test@gmail.com"
    gmail_password = '******'

    sent_from = gmail_user
    to = ["test1@gmail.com"]
    subject = 'Message'
    body = "Hi There! Done1"

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

    %s
    """ % (sent_from, ", ".join(to), subject, body)
    try:
        server = smtplib.SMTP_SSL('smtp.gmail.com', 465)
        server.ehlo()
        server.login(gmail_user, gmail_password)
        server.sendmail(sent_from, to, email_text)
        server.close()

        print ('Email sent!')
    except:
        print ('Something went wrong...')
def SendEmailScenario2():
    gmail_user = "test@gmail.com"
    gmail_password = '******'

    sent_from = gmail_user
    to = ["test1@gmail.com"]
    subject = 'Message'
    body = "Hi There! Done 2"

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

    %s
    """ % (sent_from, ", ".join(to), subject, body)
    try:
        server = smtplib.SMTP_SSL('smtp.gmail.com', 465)
        server.ehlo()
        server.login(gmail_user, gmail_password)
        server.sendmail(sent_from, to, email_text)
        server.close()

        print ('Email sent!')
    except:
        print ('Something went wrong...')
SendEmailScenario1()
SendEmailScenario2()

如何在不使用MIMEText、MIMEMultipart 的情況下使其正常顯示

Answer 1

RFC822指定標頭應以'\\r\\n'終止：

field = field-name ":" [ field-body ] CRLF

此外，標頭應與正文通過空的'\\r\\n'分隔：

[正文] 由空行（即，在 CRLF 之前沒有任何內容的行）與標題分開

所以消息應該像這樣構造：

headers = "From: %s\r\nTo: %s\r\nSubject: %s\r\n\r\n"
email_text = headers + body

另請參閱smtplib 文檔中的示例。