Background Image not showing

Hi there!

I'm having problems to display an background image on Zoho mail when I'm sending an email from my server.

The email contains a <table> with the background-image property set to an absolute url for the background picture that is located on my server.

What can do I to make it work?

Btw I also went to Zoho mail settings and set the "Load external images" to "always" but it doesn't change anything.

Thanks in advance, greetings from Uruguay!