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enable identifying spammers and blocking them

In order to identify spammers we need to have one SMTP Cert per email address. Use the email address as the common name of the certificate. This way the provider can detect which user account was used for spamming.

The webapp should store the enabled cert fingerprints in a database leap_mx will query this database and look for that fingerprint, if it finds it, the user is allowed to send mail, if it doesn't exist, they cannot.

(from redmine: created on 2013-10-24, closed on 2014-07-17)