The Pascal email was sent in May last year, just months after Blunt gave birth to her first child, daughter Hazel, with her actor husband John Krasinski. No casting has yet been announced, so it remains to be seen whether Pascal won the day.
Blunt, daughter of Oliver Blunt QC and niece of former prisons minister Crispin Blunt, has previously spoken out about the physical toll of her work.
She was reportedly encouraged to lose weight for The Devil Wears Prada because her character was "on the edge of anorexia" and "literally did not eat", according to Blunt.
Last year, she appeared opposite Tom Cruise in sci-fi blockbuster The Edge Of Tomorrow, which the actress described as "the most gruelling thing I've ever done" and involved wearing armour that weighed over 32kg.
Emails also reveal that Blunt was considered for two other Sony Pictures films, both about alien invasions, which ultimately ended up going to lesser known actresses.
Pascal claimed she "loved" the idea of Blunt for Adam Sandler film Pixels, due out later this year, but the role went to True Detective actress Michelle Monaghan.
Blunt was also considered for The 5th Wave, out next year, but was pipped to the part by Maria Bello.
A spokesman for Blunt declined to comment.
- Daily Mail