Hello Project Owner,
As per the latest email marketing platform the dimension- width of the email template is 600-650px where 600px is supported most of the platform like Mailchimp, SendItNow, Aweber etc.

Of course we can provide you 720px wide template. Please note, the height of the template is based on the total content.

Please asked me if you have any question.
Thanks
Jack

Can I get both dimensions provided please.