1 $ mailq | exiqsumm 

     2 

     3 Count  Volume  Oldest  Newest  Domain

     4 -----  ------  ------  ------  ------

     5 

     6     9    13MB     66h     62h  ele.pku.edu.cn

     7     1    25KB      0m      0m  email.cz

     8     2    90KB     31h     31h  gmail.de

     9     1    37KB      6h      6h  kbb-****.de

    10     1    45KB     31h     31h  kpng.com

    11     2    3481     34h     32h  ********.*****.de

    12 ---------------------------------------------------------------

    13    16    13MB     66h      0m  TOTAL