Simple Invoices - Forum

The emails generated by the cron job contain the same content for both the HTL and plain text parts. This has been confirmed by examining the raw message, not just the rendered version. i.e.
Hi Test,
<br />
<br />
Attached is your PDF copy of Invoice XXXX
<br />
<br />
Cheers
<br />
<br />
My Company
The <br /> tags should be replace by carriage returns for the plain text version.

I've tried to remedy this myself using $this->AltBody = preg_replace('!<br />!', "\n", $this->AltBody); in class.phpmailer.php but that has no effect. Which file should I be looking in for this?

Alternatively, is there a way I can set the outbound email to plain text only? There seems to be no setting for this.