A bench headed by Chief Justice G Rohini did not go into the issues raised in the Public Interest Litigation (PIL) which had also sought blocking of the Aam Aadmi Party (AAP) website till the letter was withdrawn from it.
The PIL, filed by advocate Vivek Narayan Sharma, had sought a ban on the letter on the ground that it would incite people not to follow rule of law.
"Therefore, the same is very bad for the nation in the long run and would encourage anarchy and destabilise the nation's welfare, growth and peace."
It had said the letter was "defamatory and contemptuous" to the judiciary.
Former Delhi Chief Minister Arvind Kejriwal was sent to judicial custody by a trial court on May 21 and again on May 23 after he refused to furnish bail bond in a criminal defamation complaint filed against him by newly-elected Road Transport and Highways minister Nitin Gadkari.
He was released from jail after his lawyers furnished a personal bond on Kejriwal's behalf before a magistrate in Patiala House Court.
Kejriwal had earlier refused to furnish a bail bond before the court on the ground that it was against the principles of AAP to furnish bail bond in a case of political nature.
