In their most recent email, cruise ship company Holland America Line puts in a very subtle animation to draw attention. The 3-day sale has more info to offer: below the sale line the line alternates between the separate destinations and the book now option (now that’s a cta). The simpel yet beautiful execution of this gif animation makes it non-obtrusive yet draws attention: the number 1 thing an email marketer wants with their email campaigns. Below is the email, with the right column cut off so it could fit here:
Such subtleness puts the email apart from many others that are non-animated or animated in an obtrusive way. Hat tip to Holland America email designers for this design and animation implementation.