"I simply want the BBC to abide by the law and value men and women equally". "I believe you have a right to know that it is breaking equality law and resisting pressure for a fair and transparent pay structure", she said in the letter.
After the BBC publicly disclosed salaries over the summer, Gracie discovered that the two male editors were making at least 50 percent more money than herself and the other female global editor.
Gracie stepped down from her position of China editor while accusing the corporation of a "secretive and illegal" pay culture.
In an awkward twist, Gracie was on Monday scheduled to present the BBC's flagship morning radio news show with a male co-presenter whose $812,000-$880,000 annual income is nearly five times hers and three times higher than the best-paid woman performing the same role.
"This bunker mentality is likely to end in a disastrous legal defeat for the BBC and an exodus of female talent at every level", Gracie wrote.
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Despite this Gracie will remain in the employ of the BBC, where she has built her career over the past 30 years, in order to return to the United Kingdom news desk - albeit in the expectation that she will be "paid equally".
It comes months after a report exposed a huge gender pay within its most high-profile BBC journalists and presenters.
Since then there has been increasing discontent at how the BBC has dealt with the backlash. "A significant number of organisations have now published their gender pay figures showing that we are performing considerably better than many and are well below the national average".
The corporation published a series of pay reviews and audits in October which concluded that men were being paid 9.3% more than women at the BBC on average - far less than the United Kingdom average of 18.1% - and that there is "no systemic discrimination against women" at the corporation.
Gracie's suggestion that the BBC sets up an independent arbitration to settle individual cases is fascinating but also sensible.
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She also retweeted a statement from #BBCWomen-a group of over 130 broadcasters and producers- which labelled Gracie's resignation "hugely regrettable".
The corporation employs more men in key on-air roles than women.
This is not an easy problem to solve - it could mean substantial pay rises for some staff and pay cuts for others.
United Kingdom correspondent Rod Liddle told Tim Dower the BBC's dug a deeper hole.by banning their employees from talking about the issue on air, if they've already publicly supported Ms Gracie.
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