Anna-Maria Meriniemi 8c892f09cc config/forms: allow blacklisting email servers by IP (#518) ...

Adds a new config entry (EMAIL_SERVER_BLACKLIST, tuple of IPv4 addresses
as strings) and an email validator for registering, which will query all
the MX records for the domain and reject the registration if any of the
A records for any of the MX records are found in the blacklist.
If the query fails, the blacklist is ignored; the email is accepted.

2018-08-20 11:29:30 -07:00

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