[Koha] Error while configuring the email facility

Dear sir, We have installed Koha using package method in ubuntu 16.04 and while configaring for the email facility, the following error is showing root@prdmcl:/etc/koha# cat /etc/ssl/certs/Equifax_Secure_CA.pem >> /etc/postfix/cacert.pem cat: /etc/ssl/certs/Equifax_Secure_CA.pem: No such file or directory can anyone help to solve the problem. Please Thanking you -- Best regards Dr. Shankar Reddy Kolle Deputy Librarian Prof. Ram Dayal Munda Central Library Indira Gandhi National Tribal University, Lalpur, Amarkantak, Anuppur Dist, Madhya Pradesh -484887, India Phone No 09742749018