smtp using all of cpu

      We have been using the sndemail program to send emails from our RPG 
programs for over a year now.   Since last Friday our smtp servr has been 
soaking up all of the CPU.   We stop the *smtp server,  let everything clear up 
and return to "normal"  and then restart the *smtp server.   It goes well for a 
while until a program runs that uses the sndemail and then it seems to throw 
the system into a tizzy again.  If I look at active jobs for QSYSWRK  there is 
the four smtp jobs running that should be plus four others.

   QTSMTPBRCL   QTCP        BCH      .0                   DEQW    *
  QTSMTPBRSR   QTCP        BCH     9.7                   RUN       *
    QTSMTPCLTD   QTCP        BCH      .2                   DEQW    *
 QTSMTPCLTP   QTCP        PJ      1.7                   SELW    ????
 QTSMTPCLTP   QTCP        PJ      2.1                   SELW    ????
 QTSMTPSRVD   QTCP        BCH      .2                   SELW       *
 QTSMTPSRVP   QTCP        PJ      9.0                   RUN     ????
 QTSMTPSRVP   QTCP        PJ     10.9                   RUN     ????


    If I keep re-freshing active jobs I see these smtp jobs using a bunch of 
the cpu.   Does anyone know what may be happening or why?  What we can do?