The exchange, sent on August 3, 2009, is between Epstein and someone referred to as "Sarah", and was among more than three million documents published by the US Department of Justice on Friday relating to the disgraced pedophile financier.
In the email, "Sarah" thanks Epstein and refers to discussions she has been having with retailers regarding her "Sarah Ferguson brand".
She goes on to say she has "never been more touched by a friend's kindness".
"Thank you so much Jeffrey. I had the best discussion with Target on Friday, and they want desperately the whole Mothers Army project," the message reads.
"They also want to get behind my entire Sarah Ferguson brand, books etc.
"Tommy Hilfiger wants to build my entire apparel, Fragrance etc etc brand, and sell it on QVC. NBC want my Mothers Army TV Show," she said.
"Ben Silverman wants it. So too does Ryan Seacrest," she wrote.
"In just one week, after your lunch, it seems the energy has lifted.
"I have never been more touched by a friend's kindness than your compliment to me in front of my girls.
"Thank you Jeffrey for being the brother I have always wished for."
The exchanges are all dated after Epstein was convicted in 2008 for prostituting minors.
The emails also reveal Epstein wanted Ferguson to release a statement saying he was "not a pedo" and she had been "duped" into believing false allegations about him.
Epstein wrote to publicist Mike Sitrick saying: "I think that Fergie can now say, I am not a pedo ... She was DUPED into believing false stories".
Sitrick responds saying: "If gentle persuasion doesn't work, it is my view that we need to turn up the heat even to the point of sending her a draft defamation lawsuit".
The documents also show Epstein received and sent multiple news articles related to the former duchess regarding her divorce from the King's brother Andrew Mountbatten-Windsor and her finances.
Andrew has faced allegations, which he strenuously denies, that he sexually assaulted a teenage Virginia Giuffre after she was trafficked by Epstein.
He paid millions to Giuffre, a woman he has claimed never to have met, to settle a civil sexual assault claim in 2022.
Andrew stepped down from royal duties in 2019 after an interview on BBC Newsnight but the publication of Giuffre's posthumous memoir, and the US government's release of documents from Epstein's estate, brought more scrutiny over his relationship with the financier.
It led to the King officially stripping his disgraced brother of both his HRH style and his prince title.
The loss of Andrew's titles meant Sarah reverted back to her maiden name of Sarah Ferguson, with the former duchess also criticised for writing to Epstein after his conviction calling him a "supreme friend", despite publicly disowning him in the media.
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