[Exim] exim references

Hi

I'm trying to use Exim for a big new mail services in a University
(~80.000 users), but my boss is asking about some references of other
universitys/big_companys that are using Exim, to be sure that is
suficcient robust (he still believe in sendmail).

Someone can tell me about some university / company that use Exim?

Thanks in advance
Marcos