thekindlyone@deepthought:~$ cat<file.txt
From: malcom@serenity.com
zdfdsfsfsf

From: anara@serenity.com
dfdf
thekindlyone@deepthought:~$ ipython
Python 2.7.6 (default, Mar 22 2014, 22:59:56)
Type "copyright", "credits" or "license" for more information.

IPython 1.2.1 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]: %paste
fname='file.txt'
try:
        with open(fname) as f:
                for line in f:
                        words=line.split()
                        if len(words)>1 and words[0]=='From:':
                                print words[1]
except:
        print 'Error opening file'

## -- End pasted text --
malcom@serenity.com
anara@serenity.com

In [2]: