Responsive Email - ENewsletter

Hi,

I've been installing the ENewletter plugin on one of my sites. All was working well, up until sending the mail itself.

On some devices/email clients (gmail for example) - the email sent is perfectly responsive.

However, on other email clients (outlook for example) - the email gets stuck to the right of the page and look dreadful. The responsiveness breaks...

Is there a fix for this? Or am I doing something wrong?

Thanks.