The May 13, 2017, email sent to Hunter by James Gilliar, from consulting firm J2cR, has been confirmed by others included on the chain.
It was also declared that sources have verified Joe Biden was "the big guy" listed among the six people who would receive the cash.
The payees were only identified with initials and nicknames with a note stating that "the big guy" would get his payment through "H".
"H" is his son Hunter, who would receive 20 percent.
The emails were sent when Biden was no longer Vice President and Trump was in office.
The email had already been published on Thursday but the identity of "the Big Guy" was not known yet.
Titled "Expectations", it details "remuneration packages" for six people in a business venture.
Hunter was identified as the "chair/vice-chair depending on agreement with CEFC," an apparent reference to the bankrupt Shanghai conglomerate China Energy Co.
His pay was "850" and the letter also noted how he "has some office expectations he will elaborate".
The email also outlines a "provisional agreement" where 80 percent of the "equity" would be distributed evenly among four people whose initials appear to link to Hunter and three other recipients.
The sender of the email, Gilliar, said: "I am happy to raise any detail with Zang if there is shortfalls?"
The email shares the equity into "20 H" - meaning 20 percent cut to Hunter; 20 percent to RW, meaning Rob Walker, also of the jc2r consultancy; 20 percent to another man called Tony Bubulinski.
The remaining 20 per cent was split with 10 per cent going to "Jim" who is otherwise unnamed, and then "10 held by H for the big guy?"
The big guy was previously unnamed until it was stated Friday that it was probably in reference to Joe Biden.
Zang appears to be a friend to Zang Jian Jun who was the former executive director of CEFC.
According to the alleged emails published about his Chinese dealings, Hunter also made a deal for $30 million plus bonuses "based on introductions alone" over three years after his father left office, then was offered a "much more lasting and lucrative arrangement."
The trove of emails has set off a series of political shockwaves.
Donald Trump exploited the release, arranged by his personal attorney Rudy Giuliani, to call his rival "a corrupt politician".
Senate Republicans said they will investigate the first tranche of emails, from Hunter's Ukrainian business partners, which appear to show the Burisma energy aide being introduced to Joe Biden when he was vice president.