* gnu/services/mail.scm (free-form-fields?, free-form-args?): Change 'string' to 'string?'. Signed-off-by: Ludovic Courtès <ludo@gnu.org>
* gnu/services/mail.scm (free-form-fields?, free-form-args?): Change 'string' to 'string?'. Signed-off-by: Ludovic Courtès <ludo@gnu.org>