just in case anyone wonders where and how to change the emails sent by the board mailer to new or rejected users (via pun approval extension) - here's how:

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\pun_approval\lang\English\mail_templates       reg_approved.tpl

<username>!
Forum administrator has approved your registration request. Thank you for registering in the forums at <url>

--
<board_mailer>
(Do not reply to this message)

might be better:

Hello <username>,
Your registration request has been approved.
Thank you for registering in the forums at: <base_url>

--
<board_mailer>
(Do not reply to this message)

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pun_approval\lang\English\mail_templates      reg_declined.tpl

Subject: Registration on <board_title>.
<username>,
forum administrator has rejected your registration request in the forums at <base_url>.

--
<board_mailer>
(Do not reply to this message)

could be

Subject: Registration on <board_title>.
Hello <username>,
The forum administrator has rejected your registration request in the forums at <base_url>.

--
<board_mailer>
(Do not reply to this message)