Hello, We have SBS, ISA and Exchange on same server. When Exchange is published with server publish wizard, packet filters are created. With this configuration we can send, but not receive emails, and telnet server.domain.com 25 has no reply. When we manually created server publish rules (5 of them for Exchange), telnet works, but no sending and receiving, and messages are stuck in SMTP queue. A and MX records are created. Thank you for help Alex Randjelovic