Plugin css problem

Hi, I´m having problems with the css sending the mail. I need to use in my email position absolute or relative in different divs. If I use simulate, the email work fine, but if I send the mail using cron from my server, all my css works, but position:relative or position:absolute is deleted.

thanks

Edit

My problem was that I need to send one background image with images over it. I finally decided to generate the images with imagecopyresample before send. Thanks