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HTTPS or Subversion.
Special characters like
are removed from the user name after saving the chances in the SMTP settings.
Keywords: SMTP settings
Probably same issue we had once with the super user password (due to not htmlencoding or something like this)
(In ) Fixes #2464
morefx, please test this feature when we release Piwik 1.6 RC (in 2 or 3 days) and post a comment if it still doesnt work. thanks!