421 4.3.2 Service not active

Hi,

E2K13CU1 with default settings added to working existing E2K10SP3 organization.

Mail doesn't leave Drafts folder (sent form OWA).

Telnet to server at port 25 responds after MAIL FROM: with:

421 4.3.2 Service not active (exactly - didn't found anything like this anywhere)

I checked DNS (also set custom DNS config in E2K13 ecp, all services are running, no custom AV, no low disk space, no events.

Thank you

Richard