[Exim] POP-before-SMTP

HI!

My ISP have a buggy smtp, so I want to use relay of my hosting
provider as smarthost. But they are require me to authentificate at
their POP server before relaying. Is there a way to do it with exim?
Or maybe I can run some external program (fetchmail, for example)
before delivering with smtp transport?

--
Alexey Promokhov <ayp(at)ayp.msk.ru>, 2:5020/2388.1513@fidonet