Hello A problem with incoming E-mails.Newly installed SBS2008 returns 421 4.3.2 error when connected via telnet from outside. When connected from LAN, Exchange responds with220host.domain.com Microsoft ESMTP MAIL Service ready. Port 25 is redirected to local IP, excluded from firewalls. At the moment it works in one site with old SBS2003, but the time is limited and the old one will have to be removed. OWA on the new server works fine from both inside and outside.SBS installed with typical configuration, no additional antiviruses or firewalls.If there are any suggestions, please help. Thanks in advance.

Incorrect remote servers IP range on the receive connector would be the most possible cause, which will cause error 421 4.3.2 via telnet. Please see the troubleshooting steps in this thread Notes: For questions about exchange on the SBS please use the SBS 2008 Newsgroup which would be the most relevant place for the question

Thanks, that was the cause of the problem. SBS self-generated connectoronly includes local subnet.

J Glad to help