Want to advertise a product or service in your MailPress newsletter? I did this by adding a horizontal banner ad at the bottom of the newsletter email, just above the footer. Here's how:
Firstly, create a horizontal banner ad image using The Gimp or some other graphics editing package. Make it the same width as the header image in your theme, which you can work out by looking for HEADER_IMAGE_WIDTH in your MailPress theme's MP_theme_html.class.php. I found a height of about 100 pixels looked good for me. Save the image in your theme's images directory named horizbanner.jpg.
Secondly, add these lines to the end of the style array in your theme's style.php:
'bannerad_img' => "margin:0 4px; border:none; padding:0;",
Finally, add these lines to the top of your theme's footer.php:
<a href="http://site.com/targeturl" title="Click Here to Get The Product" rel="generator"> <img src='images/horizbanner.jpg' <?php $this->classes('bannerad_img'); ?> /> </a>
Customise the target URL in the href field to point to the page you want readers to visit when they click, and the title to describe the product they'll be getting.