If you encounter errors when installing amavisd-new and the compilation claims that mfapi.h is not present on the system.
do this operationÂ
 On debian systems (include Ubuntu)
apt-get install libmilter-dev
On Mandriva
urpmi sendmail-devel
On SuSe
zypper install sendmail-devel
On CentOS& Fedora
yum install sendmail-develRetry the operation
