Customize email template

Hello,

I am using this plugin, and very happy with this, such a awesome plugin and everythig is working fine.

I want to customize all email notifications, means I want to add custom header, footer some design to the email notifications. I tried the same, but when I use my website’s logo(URL) in header, the image not showing in email, instead the image “src” gets modified and image not showing in gmail.

I was customized lots of email templates earlier, but this is getting an issue, to do the same.

Can anyone suggest me something, how Can I do this?

Thanks