Others have provided specific re's to extract the SMTP address, here is a more generic solution which will grab all the fields into a structure- 
while (<DATA>){
  chomp;
  my %rec=();
  while ( /
       ([^:]*)    # any amount of non ":"'s -better as ([A-Z0-9]*)?
          :       # followed by a colon
       ([^%]*)    # any amount of non "%"'s
       %{0,1}     # followed by 0 or 1 % characters
      /xg ){
         $rec{$1}=$2;
  }
  print $rec{SMTP}, "\n";  # for example
}

__DATA__
SMTP:makeusbetter@domain.com%X400:c=US;a= ;p=domain ;o=domain;s=makeus
+better;%CCMAIL:makeusbetter at domain%
CCMAIL:Hunter, Sandy at domain%MS:domainin/domain/sandy%SMTP:sandyh@do
+main.com%X400:c=US;a= ;p=domain

[download]

The second line of your sample data did not end with an % which I suspect it normally would so I made the % char optional, I think for your actual data you could change the re to /([^:]*):([^%]*)%/g

--
my $chainsaw = 'Perl';

In reply to Re: Parsing a csv file from Exchange by greenFox
in thread Parsing a csv file from Exchange by cajun

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