SMTP behavior: 553 5.5.2 Bad command format(h)

["Miguel Mata-Cardona" <mmata () intercom com sv>]

WTF? can anyone please explain me why must I enclose my 
address between the "<>"?


220 cassiopeia.remeyewear.com ESMTP service
helo me.intercom.com.sv
250 cassiopeia.remeyewear.com talking to ip168-243-227-1
.243.227.171])
mail from:postmaster () intercom com sv
553 5.5.2 Bad command format(h)
mail from: postmaster () intercom com sv
553 5.5.2 Bad command format(h)
mail from:<postmaster () intercom com sv>
250 OK - mail from <postmaster () intercom com sv>
quit
221 cassiopeia.remeyewear.com connection


Connection to host lost.


-- 
Miguel Mata-Cardona
Intercom El Salvador
mmata () intercom com sv
voz: ++(503) 278-5068
fax: ++(503) 265-7024