COIMBATORE: The postal department has released a special set of thanksgiving postcards on the theme “We salute the corona warriors”.The cards are released in four categories, including ones with red and golden special cancellations, designed on social distancing. The cards released on Friday at the regional office aim at honouring the previous service of doctors, nurses, police authorities, postmen and conservancy workers during the pandemic, said senior superintendent of post offices, Coimbatore division, Sudhir Gopal Jakhere.The postcards released by postmaster general of the western region Sheuli Burman are priced at Rs 15 for the plain postcards, Rs 25 for picture postcards with red cancellations and Rs 50 for picture postcards with golden cancellations.The picture postcards will be available for sale at all head post offices and sub post offices of the Coimbatore division. “We encourage people to send these postcards to people they know working at the frontline,” said Jakhere.