FS#2845 Disabled /e modifier breaks mail sending

Backend

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  2013-09-12 Michitux

  As reported in the forum https://forum.dokuwiki.org/thread/10340 when the /e modifier is disabled sending mails will break because the body of the mail is encoded using the mail_quotedprintable_encode-function which uses the /e modifier. There are two solutions for this problem: a) get rid of the /e modifier (and check if we use it anywhere else which might not be trivial) b) check for the /e-modifier during installation if possible. As this is a fatal error it might not be possible to check for it without breaking DokuWiki and as this function is only used in the send action we should not break DokuWiki itself by checking for it.
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  2013-10-12 andi

  mail_quoted_printable is no longer used in DokuWiki's core mail functions and exists for backward compatibility only. Plugins should switch to using the Mailer class instead to avoid this problem.