A conservative Christian group orchestrated a campaign to spam federal Liberal MPs with thousands of emails in support of Prime Minister Tony Abbott ahead of last month's spill vote.

ABC's Four Corners program has revealed the campaign was run by lobby group the National Civic Council (NCC), which emailed thousands of its members and associates, urging them to contact the Liberal MPs.

It follows the leak of a confidential message from party treasurer Philip Higginson pushing for Peta Credlin's removal as Mr Abbott's chief of staff.

The emails link to a live webpage hosted by sister organisation, The Australian Family Association, where almost 100 Liberal MPs could be contacted with a single click.

MPs described being deluged with emails leading up to the leadership spill.

"In the last few days the emails have been overwhelmingly flooding the office saying all this nonsense about leadership has gone far too far, and the emails are now overwhelmingly saying 'stick to the team you've got'," Senator Eric Abetz told ABC Hobart at the time.

Four Corners uncovered the campaign after a detailed instruction email was inadvertently sent to a Sydney barrister.

NCC vice president Patrick Byrne, who organised the email campaign, said it was effective.

"Our email campaign would've gone out to maybe 10,000 people; I'm not exactly sure and I don't have direct feedback, but I think it's had some influence," he told Four Corners.

One NCC email, obtained by Four Corners, warned about the possibility of either Malcolm Turnbull or Julie Bishop being elected to the leadership.

"Whatever his failings, the alternatives are Malcolm Turnbull, who failed as leader, and Julie Bishop, who was forced to resign as shadow treasurer due to dissatisfaction within Liberal ranks over her performance," one email read.

The emails credit Mr Abbott with holding the line on same-sex marriage and repealing the carbon tax.

The Prime Minister is held in high regard by the NCC.

Mr Abbott described its founder, Bob Santamaria, as, "my first political mentor", in his book Battlelines.

Not all recipients followed the NCC's instructions.

Sydney barrister Robert Colquhoun instead emailed MPs urging them to dump the Prime Minister.

"If Tony Abbott is NOT replaced my vote will go elsewhere," Mr Colquhoun wrote.

Speaking to Four Corners, Mr Colquhoun said he felt insulted by the email.

"We were being asked to act like robots," he said.

"I believe that everyone should exercise their own discretion, their own intelligence, their own knowledge, their own capacity, and exercise that in making their own decision, and not just to follow the lead because some organisation has told you to do it."