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2) If you do not need to change the default plugin
skip to the next step. Otherwise, change into the
directory, copy config.php.sample to config.php and edit
config.php, making adjustments as you deem necessary.
Sorry. Missed that part in install doc. Maybe other html_mail configuration options have configuration defaults and work without config.php, but spellcheck depends variable which is only set in configuration file. Your error indicates that html_mail_aspell_path configuration setting is not set.