AdminEmailHandler should allow overriding the mail part of emit

[Keryn Knight <django@…>]

Imagine I want, for some subset of errors, to instead mail ... well, anyone but the ADMINS, at the moment, this is difficult because subclassing AdminEmailHandler to replace the mail.mail_admins part also means copying the entire emit method. It would be useful if a method could be used instead, like so:

class MyAdminEmailHandler(AdminEmailHandler):
    def send_mail(self, **kwargs):
        mail.mail_who_I_say(connection=self.connection(), **kwargs)

With the original implementation changing such that instead of emit() calling mail.mail_admins it instead calls self.send_mail(subject=subject, message=message, html_message=html_message)

[Berker Peksag]

​https://github.com/django/django/pull/3495

[Tim Graham <timograham@…>]

In d552da1f8d42b7c6db992fee42bc4781f5fdde43:

Fixed #22407 -- Added AdminEmailHandler.send_mail().