I don't know if all of the NY-Post-published emails are among those, but according to a WaPo investigation (published on March 30), a number of interesting emails from the cache carried cryptographic authentication.
Thousands of emails purportedly from the laptop computer of Hunter Biden, President Biden’s son, are authentic communications that can be verified through cryptographic signatures from Google and other technology companies, say two security experts who examined the data at the request of The Washington Post. [...]
In particular, there are verified emails illuminating a deal Hunter Biden developed with a fast-growing Chinese energy conglomerate, CEFC China Energy, for which he was paid nearly $5 million, and other business relationships. Those business dealings are the subject of a separate Washington Post story published at the same time as this one on the forensic examinations of the drive. [...]
Among the emails verified by Williams and Green were a batch of messages from Vadym Pozharskyi, an adviser to the board of Burisma, the Ukrainian gas company for which Hunter Biden was a board member. Most of these emails were reminders of board meetings, confirmation of travel, or notifications that his monthly payment had been sent.
Both Green and Williams said the Burisma emails they verified cryptographically were likely to be authentic, but they cautioned that if the company was hacked, it would be possible to fake cryptographic signatures — something much less likely to happen with Google.
One of the verified emails from Pozharskyi, which was the focus of one of the initial stories from the New York Post, was written on April 17, 2015. It thanked Hunter Biden “for inviting me to DC and giving me an opportunity to meet your father and spent [sic] some time together.”
When the email first emerged in the New York Post about three weeks before the 2020 election, the Biden campaign and Hunter Biden’s lawyer both denied that Pozharskyi had ever met with Joe Biden. Asked recently about the email, the White House pointed to the previous denials, which The Post has examined in detail.
But the files collection also had some evidence of post-capture activity:
Soon after that period of inactivity — and months after the laptop itself had been taken into FBI custody — three new folders were created on the drive. Dated Sept. 1 and 2, 2020, they bore the names “Desktop Documents,” “Biden Burisma” and “Hunter. Burisma Documents.”
Williams also found records on the drive that indicated someone may have accessed the drive from a West Coast location in October 2020, little more than a week after the first New York Post stories on Hunter Biden’s laptop appeared.
Over the next few days, somebody created three additional folders on the drive, titled, “Mail,” “Salacious Pics Package” and “Big Guy File” — an apparent reference to Joe Biden.
The WaPo story notes that some 22,000 emails were cryptographically verified, although the total number of emails on the drive was 129,000 (4.3GB). The drive itself had 217GB of files.
Also, some interesting emails could not be so verified:
Some other emails on the drive that have been the foundation for previous news reports could not be verified because the messages lacked verifiable cryptographic signatures. One such email was widely described as referring to Joe Biden as “the big guy” and suggesting the elder Biden would receive a cut of a business deal. One of the recipients of that email has vouched publicly for its authenticity but President Biden has denied being involved in any business arrangements.