The encoding of the mail send out by Jot is not set by default. It could be set by adding and changing this lines:
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mb_internal_encoding("UTF-8");
mail($user["email"], mb_encode_mimeheader($this->config["subject"]["moderate"], "UTF-8", "Q"), $message, "From: ".$modx->config['emailsender']."\r\n"."X-Mailer: Content Manager - PHP/".phpversion()."\r\n"."MIME-Version: 1.0"."\r\n"."Content-type: text/plain; charset=".$modx->config['modx_charset']."\r\n");
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mb_internal_encoding("UTF-8");
mail($user["email"], mb_encode_mimeheader($this->config["subject"]["moderate"], "UTF-8", "Q"), $message, "From: ".$modx->config['emailsender']."\r\n"."X-Mailer: Content Manager - PHP/".phpversion()."\r\n"."MIME-Version: 1.0"."\r\n"."Content-type: text/plain; charset=".$modx->config['modx_charset']."\r\n");
Maybe the lines with mb_internal_encoding are not necessary.
Regards
Jako