Can any of the CPAN modules such as Mail::SpamAssassin be used to flag potential outbound spam before it becomes an email?

Well not quite before it becomes an e-mail but before it leaves the server, yes. You can use Mail::SpamAssassin's spamd in association with a plugin for your MTA (such as spamass-milter for Sendmail), to process the mail before it is forwarded on it's next hop. You can for instance set the threshold such that it will bounce or drop the mails rather than simply flagging them as spam.

/J\

In reply to Re: Preventing outbound SPAM by gellyfish
in thread Preventing outbound SPAM by UnderMine

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