If you want to bcc all Toronto City Councillors, here is a compiled list of their email addresses that you can copy and paste into the bcc line of your email message:
councillor_mford@toronto.ca, councillor_holyday@toronto.ca, councillor_grimes@toronto.ca, councillor_perks@toronto.ca, councillor_nunziata@toronto.ca, councillor_pasternak@toronto.ca, councillor_perruzza@toronto.ca, councillor_colle8@toronto.ca, councillor_bailao@toronto.ca, councillor_cressy@toronto.ca, councillor_layton@toronto.ca, councillor_matlow@toronto.ca, councillor_wongtam@toronto.ca, councillor_fletcher@toronto.ca, councillor_robinson@toronto.ca, councillor_minnan-wong@toronto.ca, councillor_carroll@toronto.ca, councillor_filion@toronto.ca, councillor_bradford@toronto.ca, councillor_crawford@toronto.ca, councillor_thompson@toronto.ca, councillor_mantas@toronto.ca, councillor_lai@toronto.ca, councillor_ainslie@toronto.ca, councillor_mckelvie@toronto.ca