$ grep -oP "(?<=@)\\S+(?=,)" out.csv | sort | uniq -c | sort -nr | head -n 25 > ../../Desktop/emailhosts.txt

   4674 yahoo.com
   2586 gmail.com
   2361 hotmail.com
   2023 aol.com
    800 comcast.net
    558 msn.com
    418 sbcglobal.net
    326 verizon.net
    192 bellsouth.net
    190 cox.net
    175 att.net
    145 charter.net
    143 live.com
    132 optonline.net
    105 earthlink.net
     92 juno.com
     59 AOL.COM
     56 roadrunner.com
     53 aim.com
     51 windstream.net
     49 YAHOO.COM
     46 netscape.net
     41 ymail.com
     31 rocketmail.com
     30 embarqmail.com