I'm loving the responsive newsletter templates.

But I have a question about the use of images. Are there any guidelines to ensure that images are shown properly across all devices? From laptop to smartphone.

Do I choose Custom, Original, Fit or... ?

What about the Spacing?

Is there an ideal size I can rescale to before I upload my image?

Thanks for your advice!

Stijn

PS: if anyone has any other advice on keeping your mailings as mobile friendly as possible: let me know.