Just looking at this application as a potential tool for our business but have hit a significant snag.  Noticed that email was not being collected from the specified mailbox so went through the self certification process and it worked.  Problem is, when I tried it again this morning, the old  "could not find valid certification path.... " message came up and mail had stopped being collected.  We have three exchange servers that load balance email and I think what is happening is due to the certificate being pointed to one exchange server which may not have picked up the email.

So

Exchange1

Exchange2

Exchange3

Manage engine certificate points to exchange1 and no email flows.

Is this common and if so, is there a solution?

Thanks for any comments