Ok, so there is no better way than screenshots to test if it looks good in a mail client anyway.
Still don't get why it is formulated in this way, but keep it the way you want.
A real "about us" would be nice - who is behind this, what did they do before. Right now it doesn't tell me much "about" and "us".
You can find names of this 2 people team here : https://targeted.io/press
At this point in time, there isn't an alternative to screenshots unless you emulate/reproduce the mailing engine for each client, but then, you can't be 100% sure what you're seeing is accurate.
An example of a new feature that we have added is sending directly from your email marketing software. Say you've set up your HTML email in MailChimp ready to send, click 'Send a test' and paste in your unique Targeted.io email address, and it'll appear in your dashboard within seconds.