make un shell script to send email

Hi,
Someone Knows how to obtein a chain from a unix file, but not all the line, for exemple, for this file ,obtein only 902111111 and to keep the value, this value will be used to make a mailx.

NF=ALL,
SUBJ=
FROM: SN=CD, SE=TOPCALL, NA=, N=902111111, N=TCLFI
TO: SE=FAX, NA=, C1= ,N=902111111

thanks