Error

"Unable to send e-mail. Please contact the site admin, if the problem persists" Drupal error.

Among other possible causes including your hoster's settings you can get this error if your site name (Configuration->Site Information->Site name) contains non-English characters. Specifically because Drupal (as of version 7.14) handles [site:name] token incorrectly when constructing subject field for outgoing emails.

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