Chilling details of a scorned doctor's vile email hate campaign against her Tinder date's new girlfriend have been revealed.

Sydney radiologist Denise Jane Lee, 40, was due to face a five-day court hearing this week, accused of sending more than 9000 abusive texts, iMessages and emails to Matthew Holberton, his new girlfriend and their family members.

But after lengthy negotiations between her lawyer and the prosecutor, Lee pleaded guilty to three counts of using a carriage service to harass or menace or offend and one count of intimidation.

Lee still faces potential jail time despite six charges being withdrawn.

Shocking details have emerged about the barrage of emails Lee sent to 127 family members, friends and colleagues of Mr Holberton's new girlfriend Georgia Dempster.

Denise Lee (pictured) launched a vicious hate campaign against her former lover's new girlfriend with a barrage of emails sent to 127 family members, friends and colleagues

The court earlier heard Lee sent 9000 abusive and threatening texts and iMessages to Holberton after their 'very, very brief relationship' ended in 2015.

'I am going to f**k your life up', one haunting message read.

Another read 'I will get my revenge'.

Lee also threatened to target 'whatever you value most'.

After moving to Melbourne in early 2016, Mr Holbertson began a new relationship with PhD student Georgia Dempster.

When Lee found out about new relationship, she acted on her threats to her former lover and launched a vicious email campaign which attacked Ms Dempster's appearance, morals and purported sexual preferences, news.com.au reported.

The emails contained unfounded allegations of promiscuity, of having sex with animals and of wantonly displaying private parts.

Matthew Holberton leaves court on Monday after a former lover pleaded guilty to three counts of using a carriage service to harass or menace or offend and one count of intimidation

Lee refers to Ms Dempster as 'The Unit' in the emails.

'The Unit thinks she is sooo beautiful. Do you think The Unit is beautiful too? HAHAHAHAHAHA,' one email stated.

In another email showing an Instagram photo of Ms Dempster in active wear, Lee wrote 'It is definitely The Unit, you can tell from the same ugly clothes she is wearing top and bottom,'

Most emails were sent to Ms Dempster's colleagues at Melbourne University.

Emails were also sent to staff at Monash University, where Ms Dempster's mother Robin Bell is a respected professor.

Georgia's father Robert Dempster and his colleagues also received emails.

Denise Lee acted on threats made in some of the 9000 messages (re-created message pictured) sent to her former lover by launched an online hate campaign targeting his new girlfriend

Police prosecutor Amin Assaad told the court on Monday the emails questioned Ms Dempster's integrity, looks and her relationship with Mr Holberton'.

He added Lee's behaviour was 'nothing but stalking'.

The emails were written in late 2016 and early 2017, which police found when they raided Lee's Sydney home in December 2016.

When Lee was arrested in February 2017, she was also found with social media pictures of Mr Holberton, tracking data from his cycling routes, and information about his friends.

The court was told the correspondence was so distressing that some of Lee's victims were contemplating suicide.

Denise Jane Lee (pictured at court previously) will be sentenced in February after pleading

Magistrate Michael Barko earlier in October refused a defence application for the charges to be dismissed on mental health grounds.

He described the evidence he saw as 'vile' and followed up by saying it had a 'very real impact' on the victims.

'Taking into account all the relevant materials … I'm satisfied that at least now the defendant is not a mentally ill person,' he said.

Lee will be sentenced in February.