It is my best appsumo purchase till date. Easy to use and lots of email delivery integrations.
It is also working nice for rtl languages so anyone writing Hebrew or Arabic can use Postsheet.
Just title is not in rtl direction but body is in rtl direction for rtl languages just like gmail.
It would be nice to have some options like:
1. Translating Unsubscribe sentence to another language.
2. Adding a user to subscribers list if a user unsuscribes but then changes her/his mind. I was playing with Postsheet and unsuscribed myself to see the functionality and now I am the first unsubscriber and can not add myself back to subscribers list.
I hope this product will be developed further but still in its present stage it is already amazing and functional.