Here's an odd one (SMTP related)

Maybe this will ring some bells with someone here, or maybe
it will leave you as stumped as me.

I had  customer using SPL2EMAIL.  He said it worked great
for months, then all of a sudden it would stop.  After an
IPL, things would work again.

So, I called him today and we were able to duplicate the
problem using SNDDST.  What we were able to consistantly
find is that if the email address used for the TO: address
was ALL UPPERCASE, it would not work (no email sent,
althought the command completed normally).  If it was
lowercase, it would work.

So, we check his SPL2EMAIL command.  It's upper case.  Try
it to make sure it's not a fluke, no email.  Change the
email address used to lower case, and it worked just fine.

This one had me stumped.  But maybe there is an explanation?
I'm all ears to ANY ideas.  :)  I asked if he had to time to
run an SMTP trace on both cases.  But, since this happens
periodically, and an IPL seems to fix this "problem", it's
all about timing.