Something wrong with mail delivery after update RC5 nightly

[Kika]

So, this was only the recipients limit, but this is an other problem

The TO field in the e-mail header was kika@kikanet.hu, and this is the correct address. The sender given back this mail:

Code:

The mail system

<kika@ispcp-arpl.kikanet.hu> (expanded from <kika@kikanet.hu>): Host or
domain
    name not found. Name service error for name=ispcp-arpl.kikanet.hu
type=A:
    Host not found