An email with the subject line 'Greetings!' set in motion an effort to persuade Hillary Clinton's campaign chair, John Podesta, to meet with the head of a mining conglomerate about 'environmental' projects.

The email is included in the latest batch of emails from a massive hack posted on Wikileaks. The emails are believed to have been hacked from Podesta's personal gmail account.

'As always, I am proud of you my friend,' begins Orson Porter, a former Bill Clinton and White House aide who joined Teneo Holdings, the global communications firm headed by two Clinton confidants, Declan Kelly and Doug Band.

'As you may know I recently departed Nike and joined the Teneo group,' Porter continues in his note to Podesta, writing that he reached out to offer 'my support.'

Hillary Clinton campaign chair John Podesta agreed to take a meeting with the head of an international mining firm after getting an online plea from Bill Clinton-linked aides Doug Band and Olson Porter, hacked emails reveal

Then he followed with a pitch: asking Podesta to please meet with the CEO of BHP Billiton, an Australian-based international mining conglomerate. The CEO, Andrew Mackenzie, planned to be in Washington in March.

'BHP Billiton employees nearly 5,000 employees across the nation and will be making some additional investments,' he wrote. 'The purpose of the meeting will be to educate you on the company's expanding U.S. footprint and possible environmental partnerships,' Porter wrote.

He attached an article in the Newscorp-owned paper, The Australian, that declared the firm, BHP, to be on a 'free trade crusade.'

According to the article: 'Andrew Mackenzie has declared that an evangelism'' is required to resist protectionism and capture the benefits of free trade that underpin economic growth and jobs creation.'

Porter also appears to have forwarded the appeal to his business partner, Band, with the message: 'Will call you on this one.'

GREETINGS! Orson Porter of Teneo made the pitch to John Podesta in 2014

'FOR YOU I'LL TRY': Podesta agreed to Band's request to try to make a meeting happen

A hacked email released by WikiLeaks details how Doug Band, president of Teneo Holdings, reached out to Clinton campaign chair John Podesta to urge him to meet with a mining company CEO

Band, a longtime Bill Clinton aide, followed up with Podesta. 'Sorry to pester. Would really appreciate if you could see andrew, important to me,' he wrote.

Podesta sounds like he agreed – as a favor.

'For you, I'll try,' he wrote. He then writes Eryn Sepp, his longtime special assistant, with the subject heading 'for scheduling.'

The firm on its website does not mention environmental partnerships in its main description of what it does.

It notes that it is 'among the world's top producers of major commodities including iron ore, metallurgical coal, copper and uranium. 'We also have substantial interests in oil, gas and energy coal. We extract and process minerals, oil and gas from our production operations located primarily in Australia and the Americas,' according to the firm's web site.

Podesta is a trusted counselor to Clinton, having previously run the Center for American Progress and served as chief of staff to Bill Clinton in the White House.

He has been floated as a possible chief of staff for Hillary Clinton. The authenticity of the email couldn't immediately be confirmed, although Teneo confirmed the authenticity of another email including a 12-page memo by Band.

Doug Band penned a 12-page memo about 'Clinton Inc.'

Band is the same aide who wrote a 12-page memo where he referred to Bill Clinton's post-presidential activities as 'Clinton Inc.' in another Wikileaks email. U.S. security officials say Russia is behind the hack.

Band wrote that, using his role as the president of his own consulting firm Teneo, Band worked to raise funds for the Foundation and Clinton personally.

Band also wrote that he helped obtain 'in-kind services for the President and his family – for personal, travel, hospital, vacation and the like.'

'Throughout the past almost 11 years since President Clinton left office, I have sought to leverage my activities, including my partner role at Teneo to support and raise funds for the Foundation,' Band wrote.

'This memorandum strives to set forth how I have endeavored to support the Clinton Foundation and President Clinton personally.'

Under a section called 'For-Profit Activity of President Clinton (i.e. Bill Clinton, Inc)' Brand said he and another aide, Justin Cooper brought Clinton all four of his advisory arrangements at the time.

The appeal brought together a top aide to Hillary Clinton, and two aides close to Bill Clinton

These yielded more than $30million in personal income – with a further $66million to be paid out over the next nine years should he continue with them.