I had the same problem. It was solved. Your exchange server probably has a dns address on dns server of your internal network. The dns server of internal network should to resolve internet names on internet. It was my problem. Alex Decarli -----Mensagem original----- De: Support Account [mailto:support@xxxxxxxxxxxxxxxxx] Enviada em: quarta-feira, 19 de setembro de 2001 11:53 Para: [ISAserver.org Discussion List] Assunto: Exchange Sending Problems (Receive OK) Hello, Looking for a little help! Thanks in advance!! I have an internal exchange mail server that is setup through an ISA Server. I can receive mail ok, but with the users send mail, they sit at the SMTP server and continue to "RETRY". If I ping addresses from the mail server they resolve correctly, but the ping fails. Not sure if this is supposed to happen? I have set the default protocol rule to allow all triffac through. Any suggestions?? Thanks, Randy Sieren