Avoid the common pitfall many experts and authors fall into when you contact online editors with submissions. Do not send attachments in your initial presentation. Do not send lengthy emails that include your articles, bios and reviews. Once you have established interest you can follow up with these tools. Your only goal in the initial email is to create interest and inspire the editor to respond. Aim at creating a relationship with the editor, not simply introducing your content.
This means a brief email expressing who you are and what you what you have to offer. Given your research of their website, why would they want your work featured on their site? Answer their question: What is in it for us?
It is also crucial to avoid any distracting fonts, graphics and bold lettering. Your email should be very professional, very easy to read with short sentences that clearly state what you have to offer and how it is of benefit to the editor you are contacting. The more your email presentation matches the look of the articles on the site, the more the editor will tend to read your email. Above all, check spelling and grammar.