python - 如何从 InboundMailHandler 中提取仅电子邮件地址？

Question

关于 InboundMailHandler 的问题。

class MailHandle(InboundMailHandler):
  def receive(self, mail_message):

mail_message.sender may contained "John Bolton <john78@mail.com>". How can i extract "john78@mail.com" from it?

Answer 1

我一直在使用这个正则表达式，效果很好。从理论上讲，设计一个无法通过此正则表达式的发件人是可能的，这就是我捕获异常并警告地址的原因。不过这还没有发生。

try:
    sender = re.search('<?([^<>]+)>?$',mail.sender).group(1)
except AttributeError:
    ...

另一个答案与根据 RFC 2822 定义的官方电子邮件地址格式不兼容。

Normally, a mailbox is comprised of two parts: (1) an optional displayname that indicates the name of the recipient (which could be a personor a system) that could be displayed to the user of a mailapplication, and (2) an addr-spec address enclosed in angle brackets("<" and ">"). There is also an alternate simple form of a mailboxwhere the addr-spec address appears alone, without the recipient'sname or the angle brackets.

请注意，此片段提到了收件人，但如果您阅读规范，它也适用于发件人。

https://www.rfc-editor.org/rfc/rfc2822#section-3.4