OneView 1.20 eMail alerting not working

[Supagusti]

Dear all,

I've trouble to get the notifications working in OV 1.20.

The OV appliance keeps telling me, that my SMTP Server ist not OK. Error Message: "192.168.2.24 is not responding as a SMTP server."

I have an Exchange 2010 server and set up a receive connector, that allows anonymous connections from within the internal network) with relaying enabled.

I've tried this with telnet - works!

When OV tries to validate the server, the following is conversation can be seen:

220 INSTALLEXCH2010.install.local Microsoft ESMTP MAIL Service ready at Mon, 20 Jul 2015 09:28:38 +0200
EHLO oneview.install.local
250-INSTALLEXCH2010.install.local Hello [192.168.2.111]
250-SIZE 10485760
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-AUTH
250-8BITMIME
250-BINARYMIME
250 CHUNKING
NOOP
250 2.0.0 OK
QUIT
221 2.0.0 Service closing transmission channel

So what's wrong with this setup? Or is there a bug in OV?

Can anybody help me out?

Thanks in advance,

Thomas