Todos, exceto "E:", são explicados em Digitalização de e-mail para vírus com ClamAV e Sendmail por Peter Kaagman. Reformatando e corrigindo alguns erros de digitação:
S=local:/var/run/clamav/clmilter.sockof course is the socket created by clamav-milter
F=tells Sendmail what to do if the filter fail, blank means act as if there is no filter. You could use "R" for reject or "T" for temporary fail.
T=determines timeouts:
S:4ma timeout of 4 minutes for sending to the filter
R:4ma timeout of 4 minutes for receiving from the filter