So, if you are fairly confident about the character string that marks the end of each mail message in this file format, then the perl code that would step through a file one message at a time would be pretty simple:
{
open( IN, "pegasus.file" ) or die $!;
local $/ = "\x1a"; # change the input record separator
while (<IN>) # $_ now contains one whole message,
{ # up to and including \x1a
# do what you want with the message
# including, if you like:
@lines = split /\n/; # work on lines
# or you could strip off the pegasus header stuff
# and treat the remainder as if it were vanilla email
# (just like you'd get with common unix mail tools)
}
}
# record separator now reverts back to default
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