This newlywed couple's email to a guest has outraged the internet

Mumsnet, in particular. And you don't want to cross them.

We all know weddings can be expensive - for the guests as well as the couple. And with wedding season coming up, there has been debate over whether it’s acceptable for the newlyweds to specify that they would prefer cold hard cash as a gift and what is the right amount.

It can be stressful for all involved.